Physics Grade 10, SA2

The diagram shows a circuit with a 3Ω resistor and a 2Ω resistor connected in parallel.

The switch is open, and the ammeter reads 2.0A. The switch is now closed and the ammeter reads the total current in both resistors. What is the ammeter reading with the switch closed?

A. 1.2A

B. 3.0A

C. 4.0A

D. 5.0A

• A

• B

• C

• D

A 30Ω resistor is connected in series with another resistor and a 6.0V battery. The current in the circuit is 0.12A. A voltmeter is connected across the other resistor.

What is the reading on the voltmeter?

A. 2.4V

B. 3.6V

C. 6.0V

D. 9.6V

• A

• B

• C

• D

Three charged balls, P, Q and R are suspended by insulating threads. Ball P is negatively charged.

What are the charges on ball Q and on ball R?

A. Ball Q positif , Ball R positif

B. Ball Q positif, Ball R negative

C. Bal Q negative, Ball R positif

D. Ball Q negative, Ball R negative

• A

• B

• C

• D

Which equation can be used to calculate the resistance R of a resistor?

A. V = I ÷ R

B. I = V × R

C. R = V × I

D. V = I × R

• A

• B

• C

• D

In which unit is potential difference measured?

A. ampere

B. ohm

C. volt

D. watt

• A

• B

• C

• D

An ammeter and an 18Ω resistor are connected in series with a battery. The reading on the ammeter is 0.50A. The resistance of the battery and the ammeter can be ignored.

What is the electromotive force (e.m.f.) of the battery?

A. 9.0N

B. 9.0V

C. 36N

D. 36V

• A

• B

• C

• D

In the circuit shown, the ammeter reads 2.0A and the voltmeter reads 12V.

How much energy is transferred by the resistor in 10 seconds?

A. 2.4 J

B. 14.4 J

C. 240 J

D. 1440 J

• A

• B

• C

• D

The amount of charge flowing through a cross-sectional area of a wire per unit of time is called:

A. Voltage

B. Power

C. Resistance

D. Current

• A

• B

• C

• D

A group of physics students performs an experiment with electric circuits. Which of the following circuits can be used to measure the electric current and voltage?

• A

• B

• C

• D

An ammeter connected in series with three resistors reads an electric current of 2 A. What is the electric current flowing trough resistor R3?

A. 1 A

B. 2 A

C. 3 A

D. 4 A

• A

• B

• C

• D