Advertisements
Advertisements
प्रश्न
State the position of heating element with respect to principal focus of concave reflector and give reason for choosing this position.
उत्तर
The heating element is between the pole and principal focus of concave reflector. This in turn, gives rise to a divergent beam of heat radiations.
APPEARS IN
संबंधित प्रश्न
State two factors on which the electrical energy consumed by an electrical appliance depends.
Which quantity has the unit of watt?
Write the formula for electric power in terms of potential difference and current.
A potential difference of 6 V is applied across a 3 Ω resistor. What is the current flowinq throuqh the circuit?
Name three main characteristics of an heating element.
‘The current rating of a fuse is 5A’. Comment on this statement.
Of the three connecting wires in a household circuit: Which two of the three wires are at the same potential? In which of the three wires should the switch be connected?
At what voltage is the electric power generated at the generating station? Explain the transmission of this power to your house.
Two resistances R1 = 4Ω and R2 = 6Ω are connected in series. The combination is connected with a battery of e.m.f. 6V and negligible resistance. Calculate:
(i) the heat produced per minute in each resistor,
(ii) the power supplied by the battery.
A electric bulb is rate 220 V, 60 W. its electric cell resistance is nearly
