How much more efficient is the electric motor than the steam engine?

• 75% more efficient

• 65% more efficient

• 85% more efficient

What supplies energy in an electric

circuit?

• conductor

• light bulb

• battery

Which material is a conductor?

• plastic

• silver

• glass

Which switch or switches must be closed to make the lamps light?

• only switch 1

• only switch 2

• switches 1 and 2

Is this an open circuit or a closed circuit?

• open

• closed

In a complete circuit, the wire is the_____________.

• load

• conductor

• power source

Is this an open circuit or closed circuit?

• open

• closed

Which type of circuit is Circuit A?

• series

• parallel

• perpendicular

Which item is a resistor in Circuit B?

• light bulbs

• wire

• battery

Why did the person who made Circuit A probably connect the wires to a penny?

• They needed to use a penny to make the bulb light.

• They were testing to see if the penny conducts electricity.

• The penny will prevent sparks.