Voltage Drop Across Resistor in Parallel Calculator

In a parallel circuit, the voltage drop across each resistor is determined by Ohm’s law: V = I * R, where V is the voltage drop, I is the current flowing through the resistor, and R is the resistance of the resistor. Each resistor has a voltage drop based on its individual current and resistance values while sharing the same source voltage.

To calculate the voltage drop across resistors in parallel, you’ll need the values of the individual resistances (R) and the total current (I_total) flowing into the parallel branches. Here’s a table showing the voltage drop across each resistor in a parallel circuit:

Resistor (R) (Ohms)	Current (I) (Amps)	Voltage Drop (V) (Volts)
R1	I1	V1 = I1 * R1
R2	I2	V2 = I2 * R2
R3	I3	V3 = I3 * R3
…	…	…

In this table, you would fill in the values for each resistor’s resistance (R), the corresponding current (I) that flows through each resistor, and then calculate the voltage drop (V) across each resistor using Ohm’s law: V = I * R.

Remember that the total current (I_total) entering the parallel branches will split among the resistors according to the current divider rule, so you may need to calculate the individual currents first.

FAQs

1. How do you find the voltage drop over a resistor in parallel? In a parallel circuit, the voltage drop across a resistor can be found by applying Ohm’s law: Voltage (V) = Current (I) x Resistance (R).
2. What is the formula for voltage drop across a resistor? The formula for voltage drop across a resistor is V = I x R, where V is the voltage drop, I is the current flowing through the resistor, and R is the resistance of the resistor.
3. Is there a voltage drop across a parallel circuit? Yes, there is still a voltage drop across individual resistors in a parallel circuit, but the total voltage remains the same as the voltage of the power source.
4. Is the voltage drop across each resistor always the same in a parallel circuit? No, the voltage drop across each resistor in a parallel circuit is not always the same. It depends on the individual resistance values and the current flowing through each resistor.
5. What is the voltage drop across the 10.0 ohm resistor? To find the voltage drop across a 10.0 ohm resistor, you would need to know the current passing through it. Without that information, an exact voltage cannot be determined.
6. What is the voltage divider equation for parallel resistors? The voltage divider equation for parallel resistors is V = (V_source) x (R_resistor / (ΣR_parallel)), where V is the voltage drop across a specific resistor, V_source is the source voltage, R_resistor is the resistance of the specific resistor, and ΣR_parallel is the sum of the resistances in parallel.
7. What is the voltage drop across a 2 ohm resistor? To determine the voltage drop across a 2 ohm resistor, you need the current flowing through it. Without the current, you cannot calculate the voltage drop.
8. How do you find the voltage in a parallel circuit? In a parallel circuit, the voltage remains the same across all components connected in parallel. You simply use the voltage of the power source.
9. What is the voltage drop across the 12 ohm resistor? Without the current flowing through the 12 ohm resistor, you cannot calculate the voltage drop.
10. Why is there no voltage drop in a parallel circuit? There is a voltage drop in a parallel circuit, but it’s not across the entire circuit. The voltage drop occurs across individual resistors in parallel, but the total voltage remains the same.
11. Is voltage drop measured in series or parallel? Voltage drop can be measured in both series and parallel circuits. It occurs across individual components, whether they are in series or parallel.
12. What happens to voltage in parallel circuits? In parallel circuits, the voltage remains constant across all branches or components connected in parallel. It does not change as you move through the parallel branches.
13. What happens when you connect two resistors in parallel? When you connect two resistors in parallel, the total resistance decreases, and the overall current through the circuit increases. Each resistor has the same voltage across it.
14. What is the voltage drop across the 15 ohm resistor? To find the voltage drop across a 15 ohm resistor, you need to know the current flowing through it. Without the current, an exact voltage cannot be determined.
15. What is the voltage drop across a 4 ohm resistor? To determine the voltage drop across a 4 ohm resistor, you need to know the current passing through it. Without the current, you cannot calculate the voltage drop.
16. What is the voltage drop across the 6 ohm resistor? To calculate the voltage drop across a 6 ohm resistor, you need the current flowing through it. Without the current value, an exact voltage cannot be determined.
17. Does voltage divider rule work in parallel? The voltage divider rule is typically used for series circuits. In parallel circuits, you can use the formula mentioned in question 6 to find the voltage drop across a specific resistor.
18. What is the current divider rule for two resistors in parallel? The current divider rule for two resistors in parallel is I1 = (R2 / (R1 + R2)) x I_total and I2 = (R1 / (R1 + R2)) x I_total, where I1 and I2 are the currents through each resistor, R1 and R2 are the resistances of the resistors, and I_total is the total current.
19. What is the voltage across a 2 ohm resistor where the supply voltage (V) is equal to 10 volts? If a 2 ohm resistor is connected to a 10-volt supply voltage, the voltage across the resistor would be 10 volts.
20. How do you find the voltage, current, and resistance in a parallel circuit? To find voltage, current, and resistance in a parallel circuit, you need the following information:
    • Total supply voltage (V_source)
    • Individual resistor resistances (R1, R2, R3, etc.)
    • Total current (I_total)
    You can use Ohm’s law and the current divider rule to calculate these values.
21. What is the voltage drop across the 3 ohm resistor? To find the voltage drop across a 3 ohm resistor, you need to know the current flowing through it. Without the current, an exact voltage cannot be determined.
22. What is the rule for resistance in a parallel circuit? The rule for resistance in a parallel circuit is that the total resistance (R_total) is calculated as the reciprocal of the sum of the reciprocals of individual resistances (R_total = 1 / (1/R1 + 1/R2 + 1/R3 + …)).
23. What is the voltage drop across a 14.50 ohm resistor? To calculate the voltage drop across a 14.50 ohm resistor, you need to know the current flowing through it. Without the current, an exact voltage cannot be determined.
24. Do resistors in parallel have the same power? No, resistors in parallel do not necessarily have the same power. The power dissipated in each resistor depends on the current passing through it and its resistance. P = I^2 x R or P = V^2 / R can be used to calculate the power for each resistor.
25. How do you find the voltage drop in a series-parallel circuit? To find the voltage drop in a series-parallel circuit, you need to analyze the circuit and use a combination of Ohm’s law and current divider/voltage divider rules to determine the voltage drops across individual resistors or components.
26. Why does resistance drop in parallel? Resistance appears to drop in parallel because as you add more parallel paths, the total resistance decreases. This is due to the reciprocal relationship in the formula for total resistance in parallel circuits.
27. How do you check voltage across a resistor with a multimeter? To check the voltage across a resistor with a multimeter, set the multimeter to the voltage measurement mode, connect the probes in parallel across the resistor, and read the voltage displayed on the multimeter.
28. What are the rules of a parallel circuit? The rules of a parallel circuit include:
    • The voltage across each branch is the same (equal to the source voltage).
    • Current divides among branches based on their resistance (current divider rule).
    • Total resistance decreases as more branches are added.
29. What is the main disadvantage of parallel circuits? The main disadvantage of parallel circuits is that they can be complex to wire and may require more components (e.g., wires, connectors) compared to series circuits.
30. What are the disadvantages of connecting resistors in parallel? Disadvantages of connecting resistors in parallel include:
    • Lower total resistance, which may not provide the desired load.
    • Increased complexity in the circuit.
    • Potential power dissipation issues in high-current applications.
31. What are the rules for resistors in series and parallel? In series: Same current, total resistance is the sum of individual resistances. In parallel: Same voltage, total resistance is calculated reciprocally.
32. What is the voltage drop of a 250 ohm resistor? To calculate the voltage drop across a 250 ohm resistor, you need to know the current flowing through it. Without the current, an exact voltage cannot be determined.
33. What is the drop across a 150 ohm resistor? To find the voltage drop across a 150 ohm resistor, you need to know the current flowing through it. Without the current, an exact voltage cannot be determined.
34. What is the voltage drop across a 5 ohm resistor in the circuit shown below? To determine the voltage drop across a 5 ohm resistor, you would need the current passing through it. Without that information, an exact voltage cannot be calculated.
35. What is the voltage drop across a 1000 ohm resistor? To calculate the voltage drop across a 1000 ohm resistor, you need to know the current flowing through it. Without the current, an exact voltage cannot be determined.
36. What power dissipates as 3 amps crosses a 4 ohm resistor? The power dissipated as 3 amps crosses a 4 ohm resistor can be calculated using the formula P = I^2 * R, where P is power, I is current (3 amps), and R is resistance (4 ohms). So, P = (3^2) * 4 = 36 watts.
37. What is the voltage drop after impedance? Impedance is typically associated with AC circuits and includes both resistance and reactance. To calculate voltage drop after impedance, you would need the impedance value and the current. The formula is V_drop = I * Z, where V_drop is the voltage drop, I is current, and Z is impedance.
38. What is the voltage across a 5 ohm resistor? To determine the voltage across a 5 ohm resistor, you need to know the current passing through it. Without the current, an exact voltage cannot be calculated.
39. When a current of 5A flows through a resistor of 12 ohms, then the power developed? The power developed can be calculated using the formula P = I^2 * R, where P is power, I is current (5A), and R is resistance (12 ohms). So, P = (5^2) * 12 = 300 watts.
40. How to reduce 5V to 1.5V using a resistor? To reduce voltage using a resistor, you can use a voltage divider circuit. The formula for the voltage divider is V_out = (R2 / (R1 + R2)) * V_in. Choose appropriate resistor values for R1 and R2 to achieve the desired output voltage (1.5V).
41. Should voltage be measured in parallel? Voltage is typically measured in parallel across the component or portion of the circuit for which you want to determine the voltage drop.
42. What is the current divider formula in a parallel circuit? The current divider formula in a parallel circuit is I1 = (R2 / (R1 + R2)) * I_total and I2 = (R1 / (R1 + R2)) * I_total, where I1 and I2 are the currents through each branch, R1 and R2 are the resistances of the branches, and I_total is the total current.
43. How can you calculate the voltage drop across each resistor? To calculate the voltage drop across each resistor in a parallel circuit, you can use the voltage divider formula mentioned in question 6. Calculate the voltage drop for each resistor individually.
44. How do you find the voltage across a battery with two resistors? The voltage across a battery with two resistors in a parallel circuit remains the same as the battery voltage. In parallel, all components have the same voltage.
45. What is the voltage across the 2 ohm resistor due to a 20V source in the circuit shown below? To find the voltage across the 2 ohm resistor, you need to know the current flowing through it. Without the current value, an exact voltage cannot be determined.
46. What is the voltage across each resistor in parallel? In a parallel circuit, each resistor has the same voltage as the source voltage. Therefore, the voltage across each resistor is equal to the source voltage.
47. What is the voltage across a resistor in parallel? The voltage across a resistor in parallel is the same as the source voltage. In parallel, all components have the same voltage as the power source.