Electric Current

What is an electric current?

• The flow of electrons in a circuit.

• The energy that moves through a circuit.

• The resistance of a circuit.

• The voltage of a circuit.

What is the unit of measurement for electric current?

• Joules (J)

• Volts (V)

• Watts (W)

• Amperes (A)

What is the difference between an open circuit and a closed circuit?

• An open circuit has no components while a closed circuit has components.

• An open circuit allows electric current to flow while a closed circuit does not.

• An open circuit has a broken path while a closed circuit has a complete path.

• An open circuit has low resistance while a closed circuit has high resistance.

Which of the following materials is a good conductor of electricity?

• Wood

• Rubber

• Glass

• Copper

Which of the following materials is an insulator (material that can not conduct electricity) ?

• Aluminum

• Copper

• Plastic

• Silver

What is a switch?

• A device that measures electric current.

• A device that stores electric charge.

• A device that regulates electric current.

• A device that opens and closes a circuit.

What is resistance in a circuit?

• The ability of a circuit to store energy.

• The measure of how much electric charge flows through a circuit.

• The measure of how much energy is used in a circuit.

• The measure of how difficult it is for electric current to flow through a circuit.

What is the direction of flow of electric current?

• From positive to negative

• From negative to positive

• Both directions

• None of the above

Which of the following devices is used to measure electric current?

• Voltmeter

• Ammeter

• Ohmmeter

• Multimeter

Which of the following is an example of a closed circuit?

• A broken wire

• An open switch

• A complete circuit with a battery, wire, and bulb

• A circuit with no battery