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प्रश्न
उत्तर
Four components of an electrical circuit
(i) Cell 
(ii) A load (bulb) 
(iii) Key 
(iv) Connecting wire 
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संबंधित प्रश्न
An electric heater is rated at 2 kW. Electrical energy costs Rs 4 per kWh. What is the cost of using the heater for 3 hours?
(a) Rs 12
(b) Rs 24
(c) Rs 36
(d) Rs 48
How much energy does a 100 W electric bulb transfer in 1 minute?
(a) 100 J
(b) 600 J
(c) 3600 J
(d) 6000 J
A current passes through a resistor. Let K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions, respectively.
The diagram above shows a circuit with the key k open. Calculate :
(i) the resistance of the circuit when the key k is open.
(ii) the current drawn from the cell when the key k is open.
(iii) the resistance of the circuit when the key k is closed.
(iv) the current drawn from the cell when the key k is closed.
Why is the heating element of an electric oven wound on a helix? State the reason.
Name a metal that is used as an electron emitter. Give one reason for using this metal.
An electric heater is rated 220 V, 550 W. What does this statement mean?
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.
What is the resistance of an appliance rated at V volt, P watt?
