Question 1

Which of the following statements best describes a series circuit?

Accepted Answer

A circuit with only one path for current to flow.

Question 2

If one bulb in a series circuit burns out, what happens to the other bulbs?

Accepted Answer

They all turn off.

Question 3

What is the unit of electric current?

Accepted Answer

Amperes (A)

Question 4

Which device is used to measure the current in a circuit?

Accepted Answer

Ammeter

Question 5

In a parallel circuit, if one bulb burns out, what happens to the other bulbs?

Accepted Answer

The other bulbs stay lit.

Question 6

Which equation correctly relates charge ($$Q$$), current ($$I$$), and time ($$t$$)?

Accepted Answer

$$Q = I 	imes t$$

Question 7

A 9 V battery gives how much energy to each coulomb of charge passing through it?

Accepted Answer

9 J

Question 8

What is the main advantage of using a parallel circuit in household wiring?

Accepted Answer

Each device receives the full voltage of the source.

Question 9

Which of the following is a correct statement about current in a series circuit?

Accepted Answer

Current is the same at all points in the circuit.

Question 10

How is voltage measured in a circuit?

Accepted Answer

By connecting a voltmeter across the component.

Question 11

A resistor is added to a circuit. What happens to the current if the voltage remains constant?

Accepted Answer

The current decreases.

Question 12

Which formula represents Ohm’s Law?

Accepted Answer

$$V = I 	imes R$$

Question 13

In a parallel circuit with three branches, the total current $$I_T is$$:

Accepted Answer

$$I_T = I_1$ + I_2$ + I_3$

Question 14

A 12 V battery is connected to a resistor of $$4\ \Omega. $$What is the current through the resistor?

Accepted Answer

$$3\ 	ext{A}$$

Question 15

Which of the following is a disadvantage of using a series circuit for home lighting?

Accepted Answer

If one bulb fails, all bulbs go out.

Question 16

What type of energy transformation occurs in a battery when it is used in a circuit?

Accepted Answer

Chemical to electrical

Question 17

A circuit contains a 6 V battery and two 3 Ω resistors in series. What is the current in the circuit?

Accepted Answer

$$1\ 	ext{A}$$

Question 18

Which of the following materials is the best conductor for an electric circuit?

Accepted Answer

Copper

Question 19

Why is a switch used in an electric circuit?

Accepted Answer

To control the flow of current.

Question 20

In a series circuit with three identical bulbs, what happens to the brightness of each bulb as more bulbs are added?

Accepted Answer

Each bulb gets dimmer.

Electric Circuits: Series and Parallel Circuits

Study Guide - Practice Questions