OCR A Level Physics A
OCR A Level Physics A Energy, Power and Resistance Exam Questions
Free OCR A Level Physics A exam questions on Energy, Power and Resistance, with mark schemes. Covers emf, pd, resistance, I-V characteristics, resistivity and electrical power.
Energy, Power and Resistance exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
OCR A Level Physics A H556 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Physics A Energy, Power and Resistance
This topic covers electrical energy.
What you need to know
- emf and pd Energy transfers per coulomb.
- I-V characteristics Resistor, lamp, diode and LED.
- Resistivity R = ρL/A, thermistors and LDRs.
- Power P = IV = I²R = V²/R, and kWh.
Common mistakes in Energy, Power and Resistance
- Mixing emf and pd.
- Wrong area units.
- Forgetting kWh is energy.
Try three Energy, Power and Resistance exam-style questions
1. Find the cost of 2 kW for 3 h at 30p per kWh. (1 mark)
Show the mark scheme answer
£1.80.
2. Explain why a thermistor's resistance falls with temperature. (1 mark)
Show the mark scheme answer
More charge carriers are released.
3. State the definition of emf. (1 mark)
Show the mark scheme answer
Energy transferred into electrical energy per unit charge.
Energy, Power and Resistance FAQs
What does this topic cover?
emf, resistance, resistivity and power.
Which practical links here?
Determining resistivity.
Do LEDs obey Ohm's law?
No, they only conduct above a threshold voltage.
Revise this topic with flashcards: OCR A Level Physics A H556 Flashcards, with mark scheme answers for Anki and Quizlet.
