Ohm's law, Kirchhoff's laws, Wheatstone bridge and circuits.
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Q1 · Current Electricity · EASY
A battery of emf 12 V and internal resistance 2 Ω is connected to an external resistance of 4 Ω. What percentage of the total power generated in the circuit is dissipated in the internal resistance?
Q2 · Current Electricity · MEDIUM
A wire has a resistance of 12 Ω. It is bent to form a circle. The effective resistance between two diametrically opposite points is: