Energy transfers

Cards (11)

definition of power
energy transferred per second
what is power directly proportional to
current and voltage
what is work done
when a charge flows through a circuit , equal to energy transferred
what is power loss proportional to
resistance , current ^2
energy transfer of a motor
kinetic
energy transfer of a kettle
thermal
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
transfer electrical power from power stations to consumers
what do transformers do
change the potential difference
what do step-up transformers do
increase potential difference -as power is constant , current decreases - less energy is lost
what do step - down transformers do
decrease potential difference , for consumer safety