Practice Voltage in Physics

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

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Quick Recap

The difference in electric potential energy per unit charge between two points. Measured in volts (V).

Voltage is like water pressure — it's the 'push' that drives current through a circuit.

Showing a random 20 of 50 problems.

Example 1

medium

Two resistors of

4 \text{ }\Omega

and

8 \text{ }\Omega

in series share a total

24 \text{ V}

. Find the voltage across each.

Example 2

hard

A capacitor of

10 \text{ }\mu\text{F}

stores

5 \text{ mJ}

of energy. Find the voltage across it.

Example 3

medium

An electron (

q = 1.6 \times 10^{-19} \text{ C}

) is accelerated through

1000 \text{ V}

. Find the kinetic energy gained.

Example 4

easy

How much work does a

9 \text{ V}

battery do to push

4 \text{ C}

of charge through a circuit?

Example 5

easy

5 \text{ V}

power supply delivers

0.2 \text{ A}

to a USB device. Find the power.

Example 6

hard

A battery has emf

12 \text{ V}

and internal resistance

0.5 \text{ }\Omega

. When connected to a

5.5 \text{ }\Omega

load, find the terminal voltage.

Example 7

easy

A battery is labeled

9

V. What does this number represent?

Example 8

medium

A series circuit has drops of

4

V_2

, and

3

V across three resistors, powered by a

15

V battery. Find

V_2

Example 9

medium

In a series loop, a

12

V battery drives two resistors. One drops

7

V. What does the other drop?

Example 10

medium

10

V battery has

0.5

V lost to internal resistance. What is the terminal voltage?

Example 11

medium

9 \text{ V}

battery transfers

450 \text{ J}

of energy to a circuit. How much charge has passed through the battery?

Example 12

easy

What is the SI unit of voltage?

Example 13

easy

Two batteries of

6 \text{ V}

each in series produce a total voltage of ___.

Example 14

medium

24

V source feeds three equal series resistors. What is the voltage across each?

Example 15

medium

Across a component,

3

C carries

36

J of energy. A student says the voltage is

108

V. What went wrong, and what is the correct value?

Example 16

easy

Voltage and ___ are the two key quantities in Ohm's law along with resistance.

Example 17

medium

A series loop has a

20

V battery and drops of

5

7

V, and

V_3

. Find

V_3

Example 18

medium

A car battery delivers

50 \text{ A}

12 \text{ V}

when starting. Find the power.

Example 19

easy

Is voltage measured 'across' or 'through' a component?

Example 20

easy

A battery does

20 \text{ J}

of work moving

5 \text{ C}

of charge. Find the voltage.

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Related Concepts

Electric Current Resistance Ohm's Law Potential Difference