Question Bank
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A 100W-220V bulb and a 60W-220V bulb are connected in series to a 220V supply. What is the total power consumed by the bulbs together?
Which of the following describes the efficiency of a transformer?
In a transformer, if the efficiency is 80%, input power is 1000W, and output voltage is 200V, find the output current.
If a current of 1A flows through a conductor for 1 hour, what is the total charge that passes through a cross-section?
Calculate the effective resistance of three resistors 3Ω, 6Ω, and 9Ω connected in parallel.
If the energy consumed by a 50W bulb in one month (30 days) is to be found, where it's used for 10 hours daily, how many units is it?
The potential difference across a 10 Ohm resistor is 50 V. How many electrons pass through the resistor in 2 seconds?
A wire of resistivity 'rho' is stretched so that its length increases by 10%. What is the approximate percentage increase in its resistance?
Three identical resistors are first connected in series and then in parallel. The ratio of their equivalent resistances (Series : Parallel) will be:
Lenz's Law is a consequence of the law of conservation of:
A house has five 40W lamps and two 100W fans. If everything runs for 10 hours a day, calculate the cost for April (30 days) at Rs 8 per unit.
Two wires of the same material have lengths in ratio 1:2 and diameters in ratio 2:1. The ratio of their resistances is:
What is the equivalent resistance between points A and B if three 6-Ohm resistors form a triangle?
A step-up transformer has a turns ratio of 1:20. If the primary current is 10A, what is the secondary current (assume 100% efficiency)?
Find the heat produced in 1 minute by a heater of 20 Ohms resistance through which 5 A current flows.
What is the current in a circuit containing a 12V battery and three 4-Ohm resistors connected in parallel?
A generator produces a voltage of 240V and delivers a current of 50A. If the resistance of the transmission line is 0.5 Ohm, how much power is lost in the line?
How much work is done to move a 2mC (millicoulomb) charge across a potential difference of 5V?
Two resistors of 30Ω and 60Ω are connected in parallel and this combination is connected to a 30V battery. What is the current through the 30Ω resistor?
A motor is 80% efficient and is supplied with 2kW. How much mechanical power does it output?