BRAINCAKEExam Style Question - 4
Question
A student connects a battery to a 4.0 Ω resistor and measures a terminal p.d. of 4.0 V. She replaces it with an 8.0 Ω resistor and the terminal p.d. rises to 4.8 V.
(a) Calculate the current in each case.
(b) Determine the e.m.f. ε and the internal resistance r of the battery.
(c) Calculate the maximum power the battery can deliver to an external resistor.
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Key terms in this lesson
- internal resistance
- The resistance inside a source of e.m.f., such as a cell or battery, which causes potential difference to be lost when current flows.
- terminal p.d.
- The potential difference across the terminals of a source when current flows, equal to its e.m.f. minus the volts lost across its internal resistance.
More in Electrical Circuits
- Electrical Work
- Electrical Power
- Power Dissipated By Resistors
- Efficiency
- Exam Style Question - 1
- Exam Style Question - 1
- Exam Style Question - 2
- Exam Style Question - 3
All 22 lessons in Electrical Circuits · All Edexcel AS-level Physics topics