The correct relation between current 'I' and amount of charge flown 'q' during a time 't' through a conductor is
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A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used is
If four resistors each of 1Ω are connected in parallel, the effective resistance will be
A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of
A coil in the heater consume power P on passing current. If it is cut into halves and joined in parallel, it will consume power
A combination of three resistances has been shown here. Effective resistance between the points A and B is
If P and V are the power and potential of device, the power consumed with a supply potential V_{1 }is
Which alloy is used to prepare the heating element of an electric iron ?
The resistance of hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W220 V lamp, when not in use ?
Two electric lamps are rated as 220 V, 100 W and 220 V, 40 W respectively. Their electric resistances are
If R_{1} and R_{2} be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then
A wire of resistance 8Ω is bent in the form of a closed circle. What is the effective resistance between the two points A and B, at the ends of any diameter of the circle ?
Two resistors are connected in series gives an equivalent resistance of 10Ω. When connected in parallel, gives 2.4Ω. Then the individual resistance are
Calculate the current flows through the 10Ω resistor in the following circuit.
The graph between current I and potential difference V in the experimental verification of Ohm’s law were drawn by four students. Which one is correct ?
Two Wires of same length and area, made of two materials of resistivity ρ_{1} and ρ_{2} are connected in parallel V to a source of potential. The equivalent resistivity for the same length and area is
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146 videos357 docs249 tests
