Advertisements
Advertisements
प्रश्न
What is meant by "electric power"?
Advertisements
उत्तर
The energy required per unit of time is called electrical power.
संबंधित प्रश्न
Name two gases which are filled in filament type electric light bulbs.
An electric heater of resistance 8 Ω takes a current of 15 A from the mains supply line. Calculate the rate at which heat is developed in the heater.
Distinguish between kilowatt and kilowatt-hour.
1Kwh =`( 1 "volt "xx 1 am pere xx.............)/1000`
An electrical appliance having a resistance of 200Ω is operated at 200 V. Calculate the energy consumed by the appliance in 5 minutes (i) in joules (ii) in kWh.
Water in an electric kettle connected to a 220 V supply took 5 minutes to reach its boiling point. How long would it have taken if the supply voltage had fallen to 200 V?
An electric kettle is rated 2.5 kW, 250 V. Find the cost of running the kettle for two hours at Rs. 5.40 per unit.
The diagram shows a coil connected to a center zero galvanometerG . The galvanometer shows a deflect ion to the right when the north pole N of a powerful magnet is moved to the right as shown .
(i) Explain, why the defelct ion occurs in the galvanometer.
(ii ) State whether th e current in the coil is cl ockwise or anticl ockwise
when viewed from the end P.
(iii ) State th e observation in G when the coil is moved away from north
pole N of the magnet keeping the magnet stationary.
(iv)State the observation in G when both the coil and the magnet are
moved to right at th e same speed .
What is the energy conversion when an electric current passes through a metallic wire?
The electric bulbs used these days have a coil-coiled filament. State its reason.
‘The current rating of a fuse is 5A’. Comment on this statement.
State two advantages of filling an inert gas in an evacuated electric filament lamp.
What is the order of current drawn by appliances connected to the ‘light circuit’ of a household?
How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.
An electric lamp A of 40 W and another electric lamp B of 100 W are connected to 220 V supply. Calculate the ratio of their filament resistances?
A bulb is connected to a battery of e.m.f. 6V and internal resistance 2Ω A steady current of 0.5A flows through the bulb. Calculate the resistance of the bulb.
A. bulb is rated at 100W, 250V and another one at 60W, 250V. What is the current flowing in the circuit if the two bulbs are put in series across a 220 V mains supply?
A cooler of 1500 W, 200 volts and a fan of 500 W, 200 volts are to be used from a household supply. The rating of fuse to be used is:
