Question Bank
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How much heat is produced in a 5 Ohm resistor when 2 A current flows through it for 10 seconds?
A galvanometer can be converted into a voltmeter by connecting a ____ resistance in ____.
What happens if a voltmeter is mistakenly connected in series with a bulb?
Two resistors are in parallel. If one resistor is removed, what happens to the total resistance of the circuit?
A step-up transformer converts 10V to 100V. If the primary has 50 turns, how many turns does the secondary have?
What is the function of a split-ring commutator in a DC motor?
Which of these devices operates based on the principle of electromagnetic induction?
If a 5-unit electricity consumption costs 50 Rupees, what is the cost per kWh?
Calculate the equivalent resistance of the network where two 4-Ohm resistors are in parallel, and this combination is in series with a 2-Ohm resistor.
A wire has resistance R. If its radius is doubled, what will be its new resistance?
Which of these provides the most energy-efficient lighting?
What is the purpose of using a soft iron core in an electromagnet?
If four 100W bulbs are used for 5 hours every day, how many units of electricity are consumed in 1 day?
Which device is used to maintain a constant current by varying resistance?
If a circuit is powered by 220V and the current is 0.2A, what is the power consumed in Watts?
A wire of resistance R is stretched to double its original length while keeping volume constant. What is its new resistance?
An ideal transformer has 100% efficiency. If input power is 500W and output voltage is 50V, what is the output current?
Two resistors R1 and R2 are connected in parallel. If R1 > R2, which of the following is true for the current (I1 and I2) flowing through them?