Quelpr
6 marksElectrical Quantities

CAPE Physics Unit 2 · 2001 · Paper 2 · Question 4(a)(ii)

Electric potential, power, and circuit analysis.

An electric heater element has resistance 7.90 Ω and an applied potential difference of 115 V. Determine the current in the wire and the power used by the heater. State what happens to the power if the potential difference is halved, and list any assumptions made.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 4(a)(i)Define the volt, and use this definition to derive the relationship P = IV.[4 marks]
  2. 4(b)(i)State Kirchhoff's laws.[3 marks]
  3. 4(b)(ii)In Figure 1, a battery of e.m.f. 12.0 V and internal resistance 0.011 Ω powers a lamp of resistance 1.20 Ω, while being charged by a charger of e.m.f. 14.0 V…[7 marks]

More practice: the rest of this paper · more Electrical Quantities questions · all CAPE Physics Unit 2 past papers