This definitions covers Key Definitions within Electrical Power & Energy for GCSE Physics. Revise Electrical Power & Energy in Electricity for GCSE Physics with 15 exam-style questions and 30 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 7 of 15 in this topic. Make sure you can use the exact wording confidently, because definition marks are often lost through vague language.
Topic position
Section 7 of 15
Practice
15 questions
Recall
30 flashcards
📖 Key Definitions
Power (P): The rate of energy transfer — the energy transferred per second. Measured in watts (W). 1 W = 1 J/s.
Watt (W): The SI unit of power. 1 watt = 1 joule of energy transferred per second.
Kilowatt (kW): 1000 watts. Used for high-power appliances.
Kilowatt-hour (kWh): The unit of energy used on electricity bills. Energy used by a 1 kW appliance running for 1 hour. 1 kWh = 3,600,000 J.
Energy transferred (E): Total energy transferred by an appliance. E = P × t. Measured in joules (J) or kWh.