Energy Flashcards
What happens when charge goes through change in voltage?
Energy is transferred
Energy transferred equation
Energy transferred (J) = Current (A) x Voltage (V) x Time (s)
What happens when there is a big current or voltage?
More energy transferred to it
What is the energy transfer with straighteners?
Kinetic -> Electricity -> Thermal
The kinetic energy store of the generator spinning at the power station is transferred by electricity to the high resistance wires in hair straighteners to a thermal energy store. Some energy is dissipated into surroundings.
Higher current = …
More thermal energy transferred to component and surroundings
Heating usually increases
resistance
Why are heating currents bad?
Because it usually reduces efficiency since more energy is transferred to heat stores instead of useful stores.
Components can melt so the circuit can’t work and fuses can melt to protect (bulbs do similar)
