Ohm's law, drift velocity, Kirchhoff's laws, Wheatstone bridge, potentiometer.
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Q1 · Current Electricity · EASY
A 4 Ω resistor is connected to a 20 V battery (negligible internal resistance). The current is:
Q2 · Current Electricity · MEDIUM
A bulb is rated 60 W at 220 V. Its resistance is approximately:
Q3 · Current Electricity · EASY
Three identical 6 Ω resistors are connected in parallel. The equivalent resistance is:
Q4 · Current Electricity · MEDIUM
A cell of EMF 2 V and internal resistance 0.5 Ω is connected across an external resistance of 1.5 Ω. The current is:
Q5 · Current Electricity · EASY
In a potentiometer experiment, the balancing length for a cell of EMF 1.5 V is 300 cm. If the balancing length for another cell is 200 cm, what is the EMF of the second cell?