Electricity and Circuits Quiz

In order for there to be a flow of charge through a wire, there must be

• a) a light bulb.

• b) electrons flowing into the wire.

• c) a potential difference across the ends of the wire.

Where do the electrons come from that produce heat and light in a light bulb?

• a) The wall plug.

• b) The bulb's wire filament.

• c) The air.

• d) The power company.

When you turn on the lights in this room, why do all the lights come on at the same instant?

• a) One electron is pushed in one end and another pops out the other end.

• b) Because they are wired in parallel.

• c) The electrons move at the speed of light.

• d) The potential difference is established across all the charges throughout the circuit at the same instant.

A wire's electrical resistance will increase as it

• a) gets thinner.

• b) gets thicker.

• c) gets shorter.

• d) cools down.

The ____________ is the same throughout a series circuit.

• a) current

• e) capacitance

• b) voltage

• c) resistance

• d) power

The total resistance of a series circuit ____________ as more resistors are added in series.

• a) decreases

• b) increases

• c) remains unchanged

What is the total resistance of a 5 ohm resistor and a 15 ohm resistor in series?

• a) 75 ohms

• b) 10 ohms

• c) 3 ohms

• d) 20 ohms

The total resistance of a pair of 6 ohm resistors in parallel is

• a) 9 ohms.

• b) 12 ohms.

• c) 3 ohms.

• d) 6 ohms.

The ____________ across each branch of a parallel circuit is equal.

• a) current

• c) voltage

• e) capacitance

• d) power

• b) resistance

A parallel circuit

• a) provides multiple pathways for electric charge to flow.

• b) provides a single pathway for electric charge to flow.

• c) is composed of parallel lines.

• d) is no different than a series circuit.