Energy transfers Flashcards
What is power
The rate in which energy is transferred by the appliance to another store
what equation links energy, time and power
Power = energy/time
What is the potential difference of the mains supply
230v
What is the current through a bulb in the mains supply (230v) when there are 40 watts in it
40w/230v = 0.17a
What equation links charge, current and time and what does it show
1) Charge = current/time
2) Charge that flows in a given time
What happens when charge flows through a resistor
1) Energy is transferred to the resistor
2) thermal energy store increases
3) resistor hotter
4) transferred to surroundings
How does one calculate energy transferred to a component by a flow of charge
Energy = potential difference x charge
When charge flows around a circuit for a given time…
Energy supplied BY battery = energy supplied TO all components in circuit
