# Resistance and Ohm's Law

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## Resistance and Ohm's Law Answer Key

**Instructions:**
Read each question carefully. Choose the answer that best fits the question. If the question involves calculations, you must show all your math work.

1.

A light bulb with resistance of 2 ohms is connected to a 4-V battery. What is the current flowing through the circuit?

- 0.5 A
- 5 A
- 2 A
- 1 A

2.

Define resistance.

- Resistance is the tendency for a material to oppose electron flow and change electrical energy into thermal energy and light.

3.

Which statement about the total resistance of the circuit is true?

- It is the same as the average resistance of any of the resistors.
- It is less than the resistance of any of the individual resistors.
- It is greater than the resistance of any of the individual resistors.

4.

What is the relationship explained by Ohm's Law?

- The current through a conductor between two points is directly proportional to the potential difference across the two points.

5.

A simple circuit contains only wires, a resistor drawing a current of 0.83 A, and a 1.5 V battery. What is the resistance of the resistor?

- [math]R=V/I=(1.5 V)/(0.83A)=1.81Omega[/math]

6.

You invent a device that requires a minimum of 5 amps to operate, but can only handle a maximum of 8 amps without being destroyed. Assuming that it will be plugged into an outlet in the U.S. which has a voltage between 110 Volts and 120 Volts, what range of resistance can your object have to work safely?

- Between 15 Ohms and 22 Ohms
- Between 13.75 and 24 Ohms
- Between 30 and 40 Ohms
- None of the above

7.

What battery voltage would be needed to send 2.5 A of current through a light bulb with 3.6 Ω of resistance?

- 1.5 V
- 1.2 V
- 9 V
- 12 V

8.

Look at the drawing. If the voltage is 6 volts and each resistor is 2 Ohms, what is the total resistance of the circuit?

- 3 Ohms
- 0 Ohms
- 1 Ohm
- 6 Ohms

9.

Meg creates a circuit with a 12 volt battery. It is a parallel circuit with 3 branches and each branch has a 3 Ohm resistor. How much voltage will be delivered on each branch?

- 4 Volts
- 12 Volts
- 36 Volts
- None of the above

10.

Complete the following statement:

If you increase the resistance in a series circuit, .

If you increase the resistance in a series circuit, .

- the current will also increase
- the current will decrease
- the voltage will increase
- the voltage will decrease

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