Basics of electric circuits

What is the SI unit for electric current?

• volt (V)

• ampere (A)

• watt (W)

• joule (J)

How should an ammeter be connected if we want to measure the electric current through an electric component?

• anywhere in the circuit

• beside the electrical energy source

• in series with the electrical component

• parallel to the electrical component

Which circuit shows the correct connections for all components?

• A

• B

• C

• D

Define potential difference.

• Rate of flow of electric current

• Amount of energy converted per unit time

• Ability to resist electric current

• Work done to move one unit charge from one point to another of a circuit

What is the SI unit for potential difference?

• ampere (A)

• joule (J)

• volt (V)

• watt (W)

What instrument is used to measure potential difference?

• ammeter

• voltmeter

• rheostat

• fixed resistor

How should a voltmeter be connected in a circuit?

• anywhere in the circuit

• beside the electrical energy source

• in series with the electrical component

• parallel to the electrical component

What is the function of a resistor?

• converts chemical energy to electrical energy

• opens and closes the circuit

• resists the flow of electric current

• measures potential difference in the circuit

Which of the following is the symbol for a fixed resistor?

• A

• B

• C

• D

Which of the following is the symbol for a rheostat?

• A

• B

• C

• D