Energy transfers — WJEC GCSE Physics
In summary: Energy transfers is a key topic in WJEC GCSE Physics. Key exam tip: Ensure you can explain the efficiency advantage of high voltage transmission in terms of reduced energy loss
Exam Tips for Energy transfers
- Ensure you can explain the efficiency advantage of high voltage transmission in terms of reduced energy loss
- Be prepared to describe energy transformations in common household items like kettles or electric motors
- Remember that the National Grid uses transformers to step up voltage for transmission and step down for local use
Common Mistakes
- Confusing the purpose of high voltage transmission with the final domestic voltage
- Failing to link energy dissipation to the efficiency of the National Grid
- Misidentifying the energy source for specific domestic appliances
Marking Points
- Explanation of why electrical power is transferred at high voltages in the National Grid
- Understanding that high voltage transmission reduces energy loss
- Description of energy transfers in domestic devices from batteries or a.c. mains
- Conversion of electrical energy into kinetic energy in motors or thermal energy in heating devices
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