Electricity - Circuits Review

What is the unit of measurement for current?

• Watt

• Ohm

• Volt

• Ampere

What are the two types of circuits?

• Series

• Parallel

• Complex

• Multiple

What happens in a series circuit?

• Each load gets the full voltage

• Alternate paths or branches are provided for electric current

• Only one path is provided for electric current

• The voltage is divided amongst the loads

What happens in a parallel circuit?

• Only one path is provided for electric current

• Alternate paths or branches are provided for electric current

• The voltage is divided amongst the loads

• Each load gets the full voltage

What is the purpose of a switch in a circuit?

• To divide the voltage amongst the loads

• To control the flow of electrons

• To increase the resistance

• To provide a steady flow of electrons

If the power source provided 120 volts of power, how much would each bulb in this picture get?

• 40 volts

• 120 volts

• 30 volts

Answer explanation

The circuit shown is a series circuit. In series circuits, they share a single pathway to the power source. This also means they share the full voltage of the battery source evenly. So if the full voltage of the battery was 120 volts and there are 4 light bulbs that share that voltage, then we would need to divide the 120 volts by 4. This would lead us to the answer of 30 volts for each light bulb.

If the power source provided 150 volts of power, how much would each bulb in this picture get if another bulb was added?

• 40 volts

• 120 volts

• 30 volts

• 50 volts

Answer explanation

The circuit shown is a series circuit. In series circuits, they share a single pathway to the power source. This also means they share the full voltage of the battery source evenly. So if the full voltage of the battery was 150 volts and there are already 4 light bulbs that share that voltage, when we add another light bulb there would be 5 light bulbs total. Then, we would need to divide the 150 volts by 5. This would lead us to the answer of 30 volts for each light bulb.

If the power source provided 120 volts of power, how much would each bulb in this picture get?

• 40 volts

• 120 volts

• 30 volts

Answer explanation

The circuit shown is a parallel circuit. In parallel circuits, they have multiple pathways from the power source to each light bulb. This also means they would all get the full voltage of the power source evenly. So if the full voltage of the battery was 120 volts and there are 3 light bulbs that each have the full voltage, then we can say all 3 of those light bulbs have 120 volts.

If the power source provided 120 volts of power, how much would each bulb in this picture get if another bulb was added?

• 40 volts

• 120 volts

• 30 volts

Answer explanation

The circuit shown is a parallel circuit. In parallel circuits, they have multiple pathways from the power source to each light bulb. This also means they would all get the full voltage of the power source evenly. So if the full voltage of the battery was 120 volts and there are 3 light bulbs that each have the full voltage, when we add another light bulb we would have 4 that have the full voltage of the power source. So, we can say all 4 of those light bulbs have 120 volts.

What is the resistance of a bulb if it operates at 12 volts and a current of 2 amperes?

• 24 ohms

• 6 ohms

• 5 ohms

• 10 ohms