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संबंधित प्रश्न
An electric bulb is rated at 220 V, 100 W. What is its resistance?
Define watt. Write down an equation linking watts, volts and amperes.
Electrical power P is given by the expression P = (Q × V) ÷ time. What do the symbols Q and V represent?
Name the S.I. unit of electrical energy. How is it related to Wh?
A simple electric circuit has a 30 V battery and a resistor ot 60 o. What will be the current in the circuit? The resistance of the oonnecting wires is negligible.
What is the energy conversion when an electric current passes through a metallic wire?
Why is a concave reflector placed behind the heating element in a room heater.
How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.
A consumer uses 4 lamps of 60 watt, 2 lamps of 40 watt, and 2 lamps of 100 watt. All these are used for 6 hour daily. Find the total bill for 30 days when the rate of energy is 75 paise per unit and the meter rent is Rs. 1.
A room has AC run for 5 hours a day at a voltage of 220V. The wiring of the room consists of Cu of 1 mm radius and a length of 10 m. Power consumption per day is 10 commercial units. What fraction of it goes in the joule heating in wires? What would happen if the wiring is made of aluminium of the same dimensions?
`[ρ_(Cu) = 1.7 xx 10_(Ωm)^-8, ρ_(Al) = 2.7 xx 10^-8 Ωm]`
