All mind maps topics

EMF and internal resistanceAQA A-Level Physics: Mind map

What this mind map covers

  • Emf
  • Equations
  • Power
  • Short circuit
  • Required practical 6

Exam questions on EMF and internal resistance

  1. A cell of emf 1.5 V and internal resistance 0.50 Ω is connected in series with a resistor of resistance 2.5 Ω.
    Calculate the energy dissipated in the internal resistance of the cell in 1.0 minute.2 marks
  2. A car battery of emf 12.6 V and internal resistance 0.020 Ω is used to start an engine. While the engine is being started the starter motor draws a current of 150 A from the battery.
    Calculate the rate at which energy is dissipated inside the battery and state the form of the energy.2 marks
  3. A student investigates a cell using a variable resistor, an ammeter and a voltmeter. The terminal pd V is measured for a range of currents I. The points lie on a straight line: V = 1.38 V when I = 0.20 A and V = 1.14 V when I = 0.60 A.
    Use the readings to determine the emf and the internal resistance of the cell.3 marks
See the full worksheet

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).