CAIE IGCSE Physics EXTENDED 4.5.6.7 100% transformer efficiency: IpVp =
CAIE IGCSE Physics EXTENDED 4.5.6.7 100% transformer efficiency: IpVp =
Practise using 100% transformer efficiency to link primary and secondary voltage, current and power in lamp, heater and coil circuits.
How this is tested
- calculate Ip or Is by applying IpVp = IsVs to primary and secondary coil values
- use power in = power out to find supply current for a lamp or heater load
- predict how step-down transformers change current when secondary voltage is lower