17 Electricity 2020J

The diagram shows a reading on an ammeter. What is the reading?

• 0.45 A

• 0.50 A

• 4.5 A

• 5.0 A

A student is to determine the resistance of resistor R.

She uses a circuit including a voltmeter and an ammeter.

Which circuit should be used?

The diagram shows a battery connected to two resistors. Three ammeters M1, M2 and M3 are connected in the circuit.

Ammeter M1 reads 1.0A.

What are the readings on M2 and on M3?

• 0.0, 0.0

• 0.5, 0.5

• 0.5, 1.0

• 1.0, 1.0

Lamps in a circuit are connected in parallel. What is the advantage of this?

• If one lamp breaks, the others remain lit.

• Less current is taken from the power supply.

• The lamps use less power than if they were connected in series.

• The potential difference across each lamp is less than that of the power supply.

There is a 5A fuse in the circuit of an appliance. What is the purpose of the fuse and in which wire is it connected?

• breaks the circuit if the current is greater than 5A, earth

• breaks the circuit if the current is greater than 5A, live

• breaks the circuit if the current is less than 5A, earth

• breaks the circuit if the current is less than 5A, live

Which row describes conventional current and electron flow in a circuit containing a cell?

• conventional current: from the negative terminal of the cell to the positive terminal of the cell; electron flow: from the negative terminal of the cell to the positive terminal of the cell

• conventional current: from the negative terminal of the cell to the positive terminal of the cell; electron flow: from the positive terminal of the cell to the negative terminal of the cell

• conventional current: from the positive terminal of the cell to the negative terminal of the cell; electron flow: from the negative terminal of the cell to the positive terminal of the cell

• conventional current: from the positive terminal of the cell to the negative terminal of the cell; electron flow: from the positive terminal of the cell to the negative terminal of the cell

A student makes four resistors using different pieces of wire. The wires have different diameters and lengths. All the pieces of wire are made of the same material. Which piece of wire will make the resistor with the largest resistance?

• diameter 0.8 mm, length 10 cm

• diameter 0.8 mm, length 17 cm

• diameter 2.0 mm, length 10 cm

• diameter 2.0 mm, length 17 cm

A cell is connected to a parallel combination of a 2.0Ω resistor and a 4.0Ω resistor. The current in the 4.0Ω resistor is 1.0A.

What is the current in the cell?

• 1.0A

• 1.5A

• 2.0A

• 3.0A

A student uses the circuit shown to determine the resistance of two identical resistors.

The voltmeter reading is 2.2 V and the ammeter reading is 0.25 A.

What is the resistance of each resistor?

• 0.275 Ω

• 0.55 Ω

• 4.4 Ω

• 8.8 Ω

In the circuit shown, A1 and A2 are ammeters. Switch S is closed. Which row is correct?

• the resistance of the whole circuit: decreases, reading of A1: stays the same, reading of A2: increases

• the resistance of the whole circuit: decreases, reading of A1: increases, reading of A2: increases

• the resistance of the whole circuit: increases, reading of A1: stays the same, reading of A2: stays the same

• the resistance of the whole circuit: increases, reading of A1: decreases, reading of A2: decreases