(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

State relative advantages and disadvantages of ring system of wiring over the tree system.

An electric heater is rated 220 V, 550 W. What does this statement mean?

An electric heater is rated 220 V, 550 W. Calculate the electrical energy consumed in 3 hours?

An electric heater is rated 220 V, 550 W. Electrical energy is also measured in kWh. What do you understand by a kilo-watt-hour?

State the reason why, in a three-pin plug, the earth pin is longer and thicker than the other two.

How does earthing prevent electrical shock?

You are required to connect a bulb, a fan and a socket outlet to the mains in one set A and an air-conditioner and a refrigerator to the mains in other set B. Will you recommend the wire of same thickness and same insulation in both? explain your answer.

At what voltage is the electric power generated at the generating station? Explain the transmission of this power to your house.

How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.

Three 250 W heaters are connected in parallel to a 100 V supply, Calculate total current taken from the supply.

Three 250 W heaters are connected in parallel to a 100 V supply, Calculate the resistance of each heater.

Three 250 W heaters are connected in parallel to a 100 V supply, Calculate the energy supply in kWh to the three heaters in 5 hour.

An electric bulb is rated 240V-60W and is working at 100% efficiency.
(i) Calculate the resistance of bulb.
(ii) (a) Draw the circuit diagram.
(b) What is the rate of conversion of energy in each bulb?
(c) Total power used by the bulbs.

With reference to the diagram shown below calculate:

(i) The equivalent resistance between P and Q.
(ii) The reading of ammeter.
(iii) The electrical power between P and Q.

State other bigger units of electric power and express them in watt.

State (i) the S. I. unit, (ii) the household unit, of electrical energy. How are these units related?

An electric kettle is rated 3kW, 250V. What should be the current capacity of the fuse with it?

I ampere of current is passed through a resistor of resistance R ohm for time t second. Obtain expression for
(i) the electrical energy, and
(ii) the electrical power spent.

How can electric energy consumed by an electric appliance be calculated in kilowatt hour (kWh)?

What is the resistance of an appliance rated at V volt, P watt?