GCSE Physics Here are some key terms for Physics... x 3.0 / 5 based on 2 ratings ? PhysicsGCSEAll boards Created by: Prabhi **Created on: 27-02-12 18:28 Voltage The unit of potential difference, equal to energy transfer per unit charge in joules per coulomb 1 of 12 Amp Measure of current 2 of 12 Watt Unit of power 3 of 12 Conservation of energy Energy cannot be created or destroyed. 4 of 12 Sankey diagram Diagram to show the energy transfer through a device. 5 of 12 Kilo- watt hour Electrical energy supplied to a 1KW electrical device in 1 hour 6 of 12 National grid The network of cables and transformers used to transfer electricity from power stations to consumers. 7 of 12 Step-up transformer used to step voltage up e.g. from a power station to the grid voltage. 8 of 12 Energy Efficiency This is defined as: useful energy transferred by a device Total energy supplied to the device 9 of 12 Step- Down transformers used to step the voltage down e.g. from the grid voltage to the min voltage used in homes and office. 10 of 12 Current Movement of charge particles through a circuit. 11 of 12 Transformer Electrical device used to charge an (alternating) voltage. 12 of 12
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