Electric Current

What is TRUE about electric current?

• It is measured by a voltmeter

• It is the flow of charges in the circuit.

• The charge in the circuit is used up by the components in the circuit

What is FALSE about an electric circuit?

• It needs a conductor for charges to flow.

• Energy is provided by the cell/ battery.

• The cell provides the charges which flow in the circuit.

• The cell provides the energy that the charges carry throughout a circuit.

What is the unitfor electric current?

• Joules

• kWh

• Volt

• Ampere/ Amp

Where do the charges come from in an electric circuit?

• From the cell

• From the conductors

• From the components

What does the ammeter measure?

• The number of charges that pass through the component.

• The size of the cell in the circuit.

• How hard it is for the current to flow through the component.

• The energy transferred by the current.

An electric current is:

• a source of energy.

• a kind of liquid inside the wires.

• tiny particles called charges flowing through the wires.

• tiny particles called volts flowing through the wires.

Look at the circuit... What is true about the ammeter on the right with (?)

• The ammeter will have no reading as the current is being used up by the components.

• The ammeter will have the same as reading as the 3A, the number of charges does not change in a circuit.

• The ammeter will have less reading than 3A as some of the energy is being used up by the components.

Which is not needed for current to flow?

• A component/ bulb

• A cell

• A conductor

• A closed path

Which is true?

• If one bulb goes off in a simple circuit, it will still work.

• If one bulb goes off in a simple circuit, it will still work but the brightness of other bulb will be less

• If one bulb goes off in a simple circuit, it will still work but the brightness of other bulb will be more

• If one bulb goes off in a simple circuit, it will not work

Materials that allow charges to move easily are called

• conductors

• insulators

• plastics

• magnetic