Electricity
Top questions
See all →- Explain the following. (a) Why is the tungsten used almost exclusively for filament of electric lamps? a) The melting point and of Tungsten is an alloy which has very high melting point and very high resistivity so does not burn easily at a hi... 2
- An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is Rate of heat produced by a device is given by the expression for power as, P= I²R Where, Resistance of the electric heater, R= 8 Ω Current d... 1
- Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes? Energy consumed by an electrical appliance is given by the expression,H= Pt Where, Power of the appliance = P Time = t Energy consumed by a... 1
- Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. Both the bulbs are connected in parallel. Therefore, potential difference across each of them will be 220 V, because no division of voltage... 1
- Compare the power used in the 2 Ω resistor in each of the following circuits: (i) a 6 V battery in series with 1 Ω and 2 (i) Potential difference, V = 6 V 1 Ω and 2 Ω resistors are connected in series. Therefore, equivalent resistance of the circuit, R = 1 + 2... 1
- A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance https://www.youtube.com/watch?v=Ru4TReFRK7A&ab_channel=Darshanclasses 2