WorksheetsUnderstanding Electrical Installation Principles
Total questions: 30
Worksheet time: 15mins
What is the unit of electrical resistance?
Ampere
Ohm
Volt
Watt
Which of the following is a conductor of electricity?
Rubber
Glass
Copper
Wood
What is the formula for calculating electrical power?
P=IV
P=IR
P=I2R
P=V2R
What is the frequency of the mains electricity supply in Great Britain?
50 Hz
60 Hz
100 Hz
120 Hz
Which of the following is a unit of electric charge?
Coulomb
Joule
Newton
Pascal
What is the purpose of a fuse in an electrical circuit?
To increase current
To decrease voltage
To protect against overcurrent
To store energy
Which of the following materials is commonly used as an insulator?
Aluminium
Silver
Plastic
Iron
What is the relationship between voltage, current, and resistance in Ohm's Law?
V=IR
I=VR
R=VI
V=I2R
What is the typical voltage of a household electrical outlet in Great Britain?
110 V
120 V
230 V
240 V
Which of the following is a renewable source of energy?
Coal
Natural Gas
Solar
Nuclear
What is the unit of electrical current?
Volt
Ohm
Ampere
Watt
Which device is used to measure electric current?
Voltmeter
Ammeter
Ohmmeter
Thermometer
What is the effect of increasing the resistance in a circuit on the current, assuming voltage is constant?
Current increases
Current decreases
Current remains the same
Current becomes zero
Which of the following is a type of alternating current (AC) waveform?
Square wave
Sine wave
Triangle wave
Sawtooth wave
What is the primary function of a transformer in an electrical circuit?
To convert AC to DC
To increase or decrease voltage
To store electrical energy
To measure electrical resistance
What is the primary function of a circuit breaker in an electrical system?
To convert AC to DC
To store electrical energy
To protect against overcurrent
To increase voltage
Which of the following is a non-renewable source of energy?
Wind
Coal
Hydroelectric
Solar
What is the primary function of a diode in an electrical circuit?
To allow current to flow in one direction
To store electrical energy
To increase voltage
To measure resistance
Which of the following is a unit of electrical power?
Ohm
Watt
Volt
Ampere
What is the effect of decreasing the voltage in a circuit on the current, assuming resistance is constant?
Current becomes zero
Current decreases
Current increases
Current remains the same
What is the primary function of a capacitor in an electrical circuit?
To store electrical energy
To increase current
To convert AC to DC
To measure voltage
Which of the following is a unit of frequency?
Hertz
Ampere
Watt
Volt
What is the effect of increasing the voltage in a circuit on the current, assuming resistance is constant?
Current becomes zero
Current remains the same
Current increases
Current decreases
What is the primary function of a resistor in an electrical circuit?
To increase voltage
To decrease current
To store energy
To convert AC to DC
Which of the following is a semiconductor material?
Aluminium
Iron
Copper
Silicon
What is the role of an inductor in an electrical circuit?
To store electrical energy in a magnetic field
To increase voltage
To convert AC to DC
To measure current
What is the primary function of a rectifier in an electrical circuit?
To measure current
To increase voltage
To store electrical energy
To convert AC to DC
Which of the following is a property of a superconductor?
High resistance
Low current
Zero resistance
High voltage
What is the primary function of a fuse in an electrical circuit?
To increase current
To store energy
To decrease voltage
To protect against overcurrent
What is the primary function of a transformer in an electrical circuit?
To measure electrical resistance
To store electrical energy
To increase or decrease voltage
To convert AC to DC
