Chapter 55 of 2363 min read
Cells, EMF, internal resistance, combinations
Why this is asked: Terminal voltage equals EMF only on open circuit — the moment current is drawn, V = E − Ir is strictly less than E. Cells in series suit a large external resistance; cells in parallel suit a small one, where less internal resistance matters most.
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- •Two heaters A and B have power ratings of 1 kW and 2 kW, respectively. The two are first connected in series and then in parallel to a fixed power source. The ratio of power outputs for these two cases is:
- •The terminal voltage of a battery whose emf is 10 V and internal resistance , when connected through an external resistance of , is:
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