4.2.4 Energy transfers
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8 Terms
What is power?
The energy transferred per second
What is power directly proportional to?
Current and voltage
What is work done?
When charge flows through a circuit and is equal to energy transferred as all electrical energy gets transferred to the appliance
What is the National Grid?
A system of cables and transformers linking power stations to consumers across the UK
What does the National Grid do?
It transfers electrical power from power stations to consumers
What do transformers do?
It changes the potential difference
What do step up transformers do?
They increase the potential difference from the power station to the National Grid so as the power is constant, current decreases so less energy is lost
What do step down transformers do?
They decrease the potential difference from the National Grid to consumers for consumer safety