Variables in electric circuits: do and review | Exit Quiz | Oak National Academy

What do you call the equipment that detects the brightness of bulbs?

• light reader

• light bulb

• light sensor

• light valuer

Answer explanation

Light sensors detect the brightness of bulbs.

Which part of an investigation do scientists use to decide whether to support or reject a scientific theory?

Answer explanation

Scientists use the results from investigations to decide whether to support or reject a scientific theory.

True or false? These results support the idea that adding bulbs reduces the brightness of a bulb.

Answer explanation

False. The results do not support the idea that adding bulbs reduces the brightness of a bulb because the brightness is higher with two bulbs than with one.

If you have 8 volts push in a circuit and 4 bulbs, how many volts will each bulb receive?

• 8

• 1

• 2

• 4

Answer explanation

If you have 8 volts push in a circuit and 4 bulbs, each bulb will receive 2 volts.

How can you make a bulb brighter in a circuit?

• add more bulbs

• remove bulbs

• remove cells

Answer explanation

You can make a bulb brighter, in a circuit, by removing bulbs.

What happens to the brightness of a bulb in a circuit if you position it closer to the cell?

• It gets brighter.

• It gets dimmer.

• It does not change.

Answer explanation

Changing the position of the bulb in a circuit does not affect its brightness so it does not change.