Electric Circuits

Question 1

How does a parallel circuit change when a branch is added?

Revolt · Accepted Answer

B: The total resistance decreases, so the current in the circuit increases.

Question 2

How do the lights in a series circuit behave when one bulb burns out?

Revolt · Accepted Answer

D: The rest of the bulbs stop shining and shut off.

Question 3

What is the main disadvantage of parallel circuits?

Revolt · Accepted Answer

D: They are complicated to design and build.

Question 4

What symbol would best represent an electric fan speed controller in an electric circuit?

Question 5

Which statement describes an open circuit?

Revolt · Accepted Answer

C: The circuit is incomplete and broken, and the lights in the circuit do not shine.

Question 6

When an electric circuit operates, a buzzer makes a sound. What happens to the electric charges in this circuit?

Revolt · Accepted Answer

D: The electric charges move from the energy source through the buzzer and back to the energy source.

Question 7

Jamal draws the circuit diagram shown.

Revolt · Accepted Answer

A: one battery, two switches, two resistors

Question 8

Roshan describes the basic parts of an electric circuit using a shower as a model. Which part of a circuit does the water pipe represent?

Revolt · Accepted Answer

A: the wire

Question 9

Look at the circuit diagram.

Revolt · Accepted Answer

B: one battery, two switches, and three light bulbs

Question 10

A large cooler is filled with water, as shown below.

Revolt · Accepted Answer

C: Closing the valve stops the flow of water, but opening a switch stops the flow of charges.

Electric Circuits Answers