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WorksheetsHousehold Circuits
Total questions: 35
Worksheet time: 18mins
What is the SI unit of electrical energy?
Joule
Watt
Ampere
Volt
What does the formula W = QV represent?
Resistance
Voltage
Power consumed
Work done
What is the power consumed when a current of 1 ampere flows through a circuit with a potential difference of 1 volt?
1 Ampere
1 Volt
1 Joule
1 Watt
What is the commercial unit of energy commonly used?
Kilowatt
Megawatt
Watt hour
Joule
What is the formula for calculating electrical power?
P = IV
P = IR
P = V/R
P = W/t
What is the larger unit of power equivalent to 1000 Watts?
Kilowatt
Joule
Megawatt
Horsepower
What is Joule's law of heating related to?
Time
Resistance
Voltage
Current
What is the purpose of a fuse in an electrical circuit?
To increase current
To limit current
To measure voltage
To store energy
What happens when the current exceeds the rating of a fuse?
The appliance works faster
The voltage increases
The circuit remains intact
The fuse melts
What is the main advantage of the ring system of wiring?
Independent appliance operation
Higher current capacity
Lower cost
Easier installation
What is the main disadvantage of the tree system of wiring?
More complex
Less efficient
Higher installation cost
Requires more space
What is the function of the earth wire in an electrical appliance?
To increase voltage
To prevent electric shock
To provide insulation
To carry current
What is the purpose of a Miniature Circuit Breaker (MCB)?
To increase voltage
To store energy
To switch off the circuit quickly
To measure current
What is the effect of connecting appliances in series?
Increases total current
Voltage is divided among appliances
Each appliance gets full voltage
Decreases resistance
What is the main reason for connecting the fuse in the live wire?
To ensure safety
To increase current
To save energy
To prevent electric shock
What is the relationship between power, voltage, and current?
P = V + I
P = I/V
P = VI
P = V/I
What is the heating effect of electric current dependent on?
Voltage and current
Current, resistance, and time
Power and voltage
Resistance only
What is the purpose of earthing an electrical appliance?
To ensure safety
To improve efficiency
To increase voltage
To prevent overheating
What is the main function of a switch in an electrical circuit?
To store energy
To measure voltage
To control the flow of current
To increase current
What is the main advantage of connecting appliances in parallel?
Increased voltage
Lower cost
Higher current
Independent operation
What is the main disadvantage of connecting appliances in series?
Each appliance operates independently
Voltage is divided
Higher current
Lower resistance
What is the purpose of the neutral wire in a household circuit?
To provide a return path for current
To increase voltage
To carry current to the appliance
To prevent electric shock
What is the typical voltage rating for household circuits?
220 V
110 V
440 V
1000 V
What is the main reason for using a thicker earth pin in a three-pin plug?
To reduce resistance
To increase current
To save space
To ensure proper earthing
What is the main purpose of a kWh meter?
To measure current
To measure energy consumption
To measure power
To measure voltage
What is the effect of high voltage on current during power transmission?
Increases current
Decreases current
No effect
Increases resistance
What is the main function of a distribution board?
To store energy
To measure energy
To distribute power to different circuits
To increase voltage
What is the main disadvantage of using a fuse?
It is difficult to install
It is not safe
It can only be used once
It is expensive
What is the main advantage of using a double pole switch?
It is cheaper
It increases current
It disconnects both live and neutral wires
It is easier to install
What is the main purpose of a power rating on an appliance?
To indicate energy consumption
To indicate voltage
To indicate current
To indicate resistance
What is the relationship between power and energy consumed over time?
Power = Energy / Time
Power = Energy + Time
Power = Energy x Time
Power = Time / Energy
What is the main reason for using a step-up transformer at a generating station?
To increase voltage
To decrease voltage
To reduce resistance
To increase current
What is the main purpose of the live wire in a circuit?
To provide a return path
To store energy
To carry current to the appliance
To measure voltage
What is the main function of a circuit breaker?
To increase voltage
To measure energy
To limit current
To disconnect the circuit automatically
What is the main advantage of using a three-pin plug?
It is cheaper
It provides better safety
It is easier to use
It is more efficient
