Electricity Past year

Diagram shows three resistors P,Q and R connected in a circuit.

• A

• B

• C

• D

Three different resistors are connected in series. WHich statement is correct?

• Potential difference across each resistor is the same.

• Power dissipated by each of the resistor is the same.

• Effective resistance is smaller than individual resistance.

• The current passing through each resistor is the same.

Diagram shows an electric circuit consists of two wires of the same material and length but different in thickness connected to a battery.

• A

• B

• C

• D

Diagram shows a complete circuit.
What is the potential difference across 

 $4\Omega$  resistor?

• 1.0 V

• 1.5 V

• 2.0 V
  

• 3.0 V

Diagram shows a circuit containing a dry cell and resistance R. The dry cell has internal resistance, r and electromotive force (emf) 1.5 V.

What is the voltmeter reading when the switch is on?

• 1.5 V

• Less than 1.5 V

• More than 1.5 V

What is electromotive force?

• The work done by a charge in a circuit.

• The work done by one coulomb of charge in a circuit.

• The work done by a source of energy in driving a charge around a complete circuit.

• The work done by a source of energy in driving one coulomb of charge in a complete circuit.

Which circuit is used to determine the electromotive force, e.m.f of a dry cell?

• A

• B

• C

• D

Diagram shows an electric circuit. When the switch is off the voltmeter reading is 9.0 V. The internal resistance of the cell is

 $1\Omega$  .
What is the ammeter reading when the switch is on? 

• 3.0 A

• 3.5 A

• 4.5 A

• 6.0 A

Diagram 25.1 shows an electromotive circuit to determine the e.m.f and internal resistance of a dry cell.

Below the Diagram 25.1 show the results of a graph of potential difference, V against current I.

e.m.f could be determine from

• V-intercept

• I-intercept

• gradient of the graph

• area under the graph

Diagram shows an electric circuit

What is the power dissipated in the resistor when the switch is on?

• 0.8 W

• 1.2 W

• 7.2 W

• 30.0 W