Advertisements
Advertisements
प्रश्न
Electrical power P is given by the expression P = (Q × V) ÷ time. What do the symbols Q and V represent?
Advertisements
उत्तर
Q represents charge, and V represents voltage or potential difference.
APPEARS IN
संबंधित प्रश्न
Which of the following is the most likely temperature of the filament of an electric light bulb when it is working on the normal 220 V supply line?
(a) 500°C
(b) 1500°C
(c) 2500°C
(d) 4500°C
State and define the household unit of electricity.
A current of 2 A is passed through a coil of resistance 75Ω for 2 minutes. (a) How much heat energy is produced? (b) How much charge is passed through the resistance?
An electric bulb, when connected across a power supply of 220 V, consumes a power of 60 W. If the supply drops to 180 V, what will be the power consumed? If the supply is suddenly increased to 240 V, what will be the power consumed?
The diagram below shows a magnetic kept just below the conductor AB which is kept in North South direction.
(i) In which direction will the needle deflect when the key is closed ?
(ii) Why is the deflection produced ?
(iii) What will be the change in the deflection if the magnetic needle is taken just above the conductor AB ?
(iv) Name one device which works on this principle.
A simple electric circuit has a 30 V battery and a resistor of 60 Ω. What will be the current in the circuit? The resistance of the connecting wires is negligible.
Tick(✓) the correct choice in the following:
In the circuit shown in the following fig, the e.m.f. of the cell is 4 volts, the current
flowing through the resistor is
If the rating of an electric bulb is 100W – 230V, Explain its meaning.
What is the order of current drawn by appliances connected to the ‘light circuit’ of a household?
