Core Concepts (Target: 'S' Pass)

• Define: What is electrical power?

• State: What is the SI unit for power?

• Write the Formula: What is the equation that links Power (P), Voltage (V), and Current (I)?

• Identify: What is the commercial unit for measuring electricity consumption in homes (the unit on your electricity bill)?

• List: Name three safety devices found in a modern domestic wiring circuit.

• Recall: What are the three wires in a three-pin plug called?

Understanding & Application (Target: 'C' Pass)

• Explain: What is the difference between electrical power and electrical energy?

• Describe: Explain the function of a fuse or a Miniature Circuit Breaker (MCB) in a household circuit.

• Apply: Why is it more energy-efficient to use an LED bulb than a filament bulb for the same amount of light?

• Explain: What is the purpose of the Residual Current Circuit Breaker (RCCB) or "trip switch"?

• Calculate: An electric iron with a power rating of 2000 W is used for 30 minutes. How many kilowatt-hours (kWh) of energy does it consume?

Analysis & Higher-Order Thinking (Target: 'B' / 'A' Pass)

• Analyse: Explain why switches and fuses are always connected to the live wire and never to the neutral wire.

• Justify: A homeowner finds that the MCB for the kitchen circuit trips every time they use the electric kettle and the microwave oven at the same time. Explain what is happening in terms of current and power.

• Calculate: An electric heater is rated at 2.3 kW and is connected to a 230 V supply. Calculate the current it draws. Would a 5 A fuse be suitable for this appliance? Justify your answer.

• Synthesize: Draw a simple schematic diagram showing the path of electricity from the main supply cable into a house, passing through the meter, main switch/isolator, RCCB, and an MCB before reaching a light bulb.

O/L Exam Tip: Be very comfortable with the formulas P = VI and E = Pt. Practice converting between Watts and kilowatts, and between seconds, minutes, and hours for energy calculations. Questions about household wiring and safety are very common.