Current Electricity questions
395 published questions with worked solutions.
- The supply voltage to a room is 120 V. The resistance of the lead wires is 6Ω. A 60 W bulb is already switched on. What is the...
- A battery with EMF E and internal resistance r is connected across a resistance R. The power consumption in R will be maximum...
- An electric power line having total resistance of 2 , delivers 1 kW of power of 250 V. The percentage efficiency of transmission...
- A cylindrical conductor of length 2 m and area of cross-section 0.2 mm² carries an electric current of 1.6 A when its ends are...
- Two resistors of 100 each are connected in series with a 9 V battery. A voltmeter of 400 resistance is connected to measure the...
- For the two cells having same EMF E and internal resistance r, the current passing through the external resistor 6 is same when...
- Statement-I : The equivalent emf of two nonideal batteries connected in parallel is smaller than either of the two emfs....
- A wire of resistance 9 Ω is bent to form an equilateral triangle. Then the equivalent resistance across any two vertices will be...
- A wire of resistance R is bent into an equilateral triangle and an identical wire is bent into a square. The ratio of resistance...
- A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6%, then the loss of power in units of...
- Two cells of emfs 1 V and 2 V and internal resistances 2 and 1 , respectively, are connected in series with an external...
- Current passing through a wire as function of time is given as I(t) = 0.02t + 0.01 A. The charge that will flow through the wire...
- There are n number of identical electric bulbs, each is designed to draw a power p independently from the mains supply. They are...
- In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of the...
- Two batteries with e.m.f. 12 V and 13 V are connected in parallel across a load resistor of 10 Ω. The internal resistances of the...
- A heating element has a resistance of 100 Ω at room temperature. When it is connected to a supply of 220 V, a steady current of 2...
- A cell of internal resistance r drives current through an external resistance R. The power delivered by the cell to the external...
- A constant voltage is applied between two ends of metallic wire. If the length is halved and the radius of the wire is doubled,...
- In a conductor, if the number of conduction electrons per unit volume is 8.5 10^ 28 m^ -3 and mean free time is 25 fs (femto...
- Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross section 5 mm^2, is v. If electron density in...
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