Power Losses in Cables
Physics: AQA GCSE Higher, topic 7.3.7
Power Losses in Cables
In a transformer, VpIp = VsIs. If the potential difference (voltage) is higher across the secondary coil (Vs) than the primary coil (Vp), the current through the secondary coil (Is) must be reduced.
Step-up transformers
- When transmitting electricity, energy is lost because the current heats the wires.
- The higher the current, the more wires are heated and the more energy is lost.
- Step up transformers increase the voltage that we use to transmit electricity.
- This reduces the current in the secondary coil and reduces the energy lost as heat during transmission.
Test yourself on Power Losses in Cables
Why is energy lost when transmitting electricity?