Current Electricity questions
395 published questions with worked solutions.
- A generator has armature resistance of 0.1Ω and develops an induced emf of 120 V when driven at its rated speed. Its terminal...
- The resistance of a wire is R. It is bent at the middle by 180° and both the ends are twisted together to make a shorter wire....
- Two electric bulbs marked 25 W − 220 V and 100 W − 220 V are connected in series to a 440 V supply. Which of the bulbs will fuse?
- The supply voltage to a room is 120 V. The resistance of the lead wires is 6 Ω. A 60 W bulb is already switched on. What is the...
- A letter 'A' is constructed of a uniform wire with resistance 1.0Ω per cm, The sides of the letter are 20 cm and the cross piece...
- A shunt of resistance 1 Ω is connected across a galvanometer of 120 Ω resistance. A current of 5.5 ampere gives full scale...
- A d.c. main supply of e.m.f. 220 V is connected across a storage battery of e.m.f. 200 V through a resistance of 1 Ω. The battery...
- A metal wire of cross-sectional area 0.5 mm ^2 and length 100 m is connected across a battery of e.m.f. 2 V and internal...
- A resistor is connected to a battery of 12 V emf and internal resistance 2 . If the current in the circuit is 0.6 A, the terminal...
- A room heater is rated 400 W, 220 V. If the supply voltage drops to 200 V, what will be the power consumed (approximately)?
- When 5 V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is 2.5 10^ -4 m s^ -1 . If...
- A 50 resistance is connected to a battery of 5 V. A galvanometer of resistance 100 is to be used as an ammeter to measure current...
- The resistance of an electrical toaster has a temperature dependence given by R(T) = R_0 [1+ (T-T_0 ) ] in its range of...
- Statement 1: Wire through which current flows gets heated. Statement 2: When current is drawn from a cell, chemical energy is...
- Unit of specific resistance is **[CPMT 1975, MP PT SCRA 1984]**
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