Advertisements
Advertisements
प्रश्न
उत्तर
APPEARS IN
संबंधित प्रश्न
Define watt. Write down an equation linking watts, volts and amperes.
Calculate the cost of operating a heater of 500 W for 20 hours at the rate of Rs 3.90 per unit.
Electrical power P is given by the expression P = (Q × V) ÷ time. What do the symbols Q and V represent?
An electric toaster draws 8 A current in a 220 V circuit. It is used for 2 h. Find the cost of
operating the toaster if the cost of electrical energy is Rs. 4.50 per kWh.
Which cable, one rated 15A and the other rated 5A will be thicker? Give a reason.
State the reason why, in a three pin plug, the earth pin is longer and thicker than the other two.
An electric kettle is rated 3kW, 250V. What should be the current capacity of the fuse with it?
What is the resistance of an appliance rated at V volt, P watt?
Two bulbs are rated: bulb A 100W, 120 V bulb B 10W, 120 V. If both are connected across a 120V supply, which bulb will consume more energy, When in series? Also calculate the current through each bulb in above cases.
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?
