Electricity Exam Review

In order to form an electrical circuit, you need to have

• wires or conductors to connect everything

• a power source

• a complete path for the current

• a light bulb or some kind of resistance

• all of the items listed

In order for current to flow in a circuit, you must have

• a complete path for the current

• two light bulbs in parallel

• a switch that is open

• two light bulbs in series

Electrical resistance is measured in

• volts

• amperes

• watts

• joules

• None of these units are correct

A closed circuit is a circuit in which charge

• can flow

• is prevented from flowing

When two light bulbs are connected in series, the

• same amount of current always flows through each bulb

• current through each light bulb is proportional to the resistance of the bulb

• neither A or B

As more lights are put into a series circuit, the overall current in the circuit

• stays the same

• increases

• decreases

As more lamps are put into a parallel circuit, the overall current in the circuit

• increases

• decreases

• stays the same

Two lamps, one with a thick filament (wire) and one with a thin filament, are connected in parallel to a battery. The current is larger in the lamp with the

• thick filament

• thin filament

• Current is the same in each

A 60-W light bulb and a 100-W light bulb are both connected in parallel to a 120-V outlet. Which light bulb has more current in it?

• the 100-W bulb

• the 60-W bulb

• Both have the same

In order for there to be a flow of charge from one place to another, there must be a

• potential difference between the two places

• conductor, such as wire, connecting the two places

• both of these need to be in place