The Brightness of the Bulbs in Electrical Circuits

What needs to be done to this circuit so that the lamp lights up?

• Close the switch

• Add a source of energy and close the switch

• Add another lamp

• Add another lamp and a switch

Peter has connected two bulbs across two batteries in a simple circuit. How can she make the bulbs dimmer?

• Replace one of the batteries with a section of wire

• Replace one of the bulbs with a section of wire

• Replace one of the batteries with a cork

• Replace the batteries for more wire

If lamp 1 is unscrewed from its holder, what will happen to lamp 2?

• It will get brighter

• It will stay the same brightness

• It will not light up

• Nothing will happen

Why is a bulb brighter when it is powered by two batteries rather than one?

• Because the flow of electricity in the circuit is less

• Because the flow of electricity in the circuit is the same

• Because the flow of electricity in the circuit is greater

• Because the flow of electricity will go backward

If lamp 2 is unscrewed from its holder, what will happen to lamp1?

• It will stay light up

• It will go out

• It will get dimmer

• It will disappear

Pick the correct sentence.

• This circuit will work because it is a closed circuit.

• Energy will freely flow in this circuit.

• This circuit will not work because there is no energy source.

• This circuit will not work because there is no switch.

The picture shows an electrical circuit. This circuit is a series circuit because:

• It has 3 light bulbs.

• The current flows through all three light bulbs are not equal.

• It uses a single battery.

• The electrical current is divided between the three light bulbs.

What will happen if one light bulb is removed from this circuit?

• The other bulbs will not light up

• The other bulbs will stay light up

• The other bulbs will get dimmer.

• The battery will become stronger.

The current has only one path or loop to flow through in this circuit.

• Series Circuit

• Parallel Circuit

Which of the two circuits would have the brightest bulbs?

• A

• B