Practical electrical and electronic circuits test questions

1

Which of the following describes this circuit?

Circuit with a battery and lamp, plus two open switches connected in parallel.

Switches in series

Switches in parallel

Lamps in series

2

Which of the following describes this circuit?

Circuit with a battery and switch, plus two resistors connected in parallel.

Fuses in parallel

Resistors in series

Resistors in parallel

3

What is the correct reading on meter V₁ in the following circuit?

The lamps are identical.

Circuit with a battery connected in series with an ammeter reading 0.1 A, a lamp, another ammeter labelled A1, another lamp and a final ammeter labelled A2. A voltmeter connected across the battery reads 6 V, and there are voltmeters connected across each lamp, labelled V2 and V2.

1 A

2 V

3 V

4

What is the correct reading on meter A₁ in the following circuit?

The lamps are identical.

1 A

2 A

0.5 A

5

What is the correct reading on meter A₂ in the following circuit?

The lamps are identical.

0.5 A

1 A

3 A

6

What is the correct reading on meter V₃ in the following circuit?

The lamps are identical.

Circuit with a battery and ammeter in series, connected to two parallel branches each containing a lamp and ammeter. The ammeter next to the battery reads 2 A and a voltmeter connected across the battery reads 6 V. The other two ammeters are labelled A3 and A4. There is a voltmeter connected across each lamp, labelled V3 and V4 respectively.

3 V

4 V

6 V

7

What is the correct reading on meter A₃ in the following circuit?

The lamps are identical.

1 A

1.5 A

2 A

8

What does a motor convert electrical energy into?

Kinetic energy

Light energy

Sound energy

9

Which component is required in a circuit containing an LED?

A light dependent resistor in series with the LED

A resistor in parallel with the LED

A resistor in series with the LED

10

A manufacturer states that, for a certain LED, the maximum voltage across the LED is \(3 V\) and current must not exceed \(12 mA\).

What is the series resistance required to protect this LED if a 9 V battery is used to power the circuit?

\[0.5 Ω\]

\[250 Ω\]

\[500 Ω\]

11

What does the symbol shown here represent?

A circuit symbol consisting of a horizontal line broken by a long rectangle with a diagonal line through it. One end of the diagonal line has an extra portion angled off, parallel to the horizontal.

LDR

Thermistor

Variable resistor

12

When does a microphone produce a voltage?

When its temperature is increased

When sounds fall on it

When light shines on it

13

What is the voltage across the \(500 Ω\) resistor?

Circuit with 9 V battery, 1 kilo-ohm resistor and 500 ohm resistor connected in series.

\[3 V\]

\[6 V\]

\[9 V\]

14

When does a bipolar transistor switch on?

The input voltage is ≥ 0.7 V.

The input voltage is ≤ 0.7 V.

The input voltage has any voltage value.

15

How would you describe the transistor in this circuit?

Two 10k-ohm resistors in series between 3V and 0V rails, base of bipolar transistor fed from point between them. 500 ohm resistor joins 3V rail and collector. Emitter connected directly to 0V rail

Always on

Always off

Alternating between on and off