Electricity and circuits

Which of the following elements in the circuit is responsible for turning it on or off?

• Bulb

• Battery

• Resistor

• Switch

Which of the following explanations best describes battery?

• A device that converts chemical energy into electricity

• A device that converts electricity into light

• A cell that cannot be recharged

• A material that does not allow electricity to pass through it

A torch battery is connected to a torch globe by two wires. The globe is glowing and giving out light. Which is the best explanation for what happens to the electric current in the wires?

• The electricity flows through wire A from the battery to the globe, which uses up all the electricity. Wire B is not needed.

• The electric current flows through both wires to the globe where it is used up.

• The electric current flows through one wire to the globe where some of it is used up. The remaining electric current flows through the other wire back to the battery.

• The electric current flows around the circuit and none is used up by the globe so that the amount of current in the two wires is the same.

Which of the following lists include only conductors of electricity?

• iron, wood, and paper

• nichrome, plastic, and paper

• mercury, copper, and carbon

• wood, plastic, and paper

In which of the following circuits will the globe(s) be brightest?

A circuit containing:

• one 2V globe and one 1.5V battery

• two 2V globes and one 1.5V battery

• two 2V globes and two 1.5V batteries

• one 2V globe and two 1.5V batteries

Which best describes a parallel circuit?

• Electricity flows along one pathway.

• The flow of electricity comes from one source.

• The flow of electricity comes from more than one source.

• Electricity flows along more than one pathway.

What is one problem with using a series circuit?

• It has a lot of series.

• It doesn't work properly.

• If one goes down, they all go down!

• There are no problems.

If bulb 1 burns out, what will occur?

• bulbs 2 and 3 will go out

• bulbs 2 and 3 receive more volts

• bulbs 2 and 3 will stay lit

• nothing will happen

What kind of circuit is this?

• Series

• Parallel

Electric current is the flow of:

• electrons

• neutrons

• protons

• none of these