Advertisements
Advertisements
प्रश्न
Express watt hour and kilowatt hour in joule.
Advertisements
उत्तर
1 kWh = 1W × 1 hour = 1000 W × (60 × 60) s
= 1W × 1s × 105 × 36 = 36 × 105 J = 3.6 × 106 J
संबंधित प्रश्न
What determines the rate at which energy is delivered by a current?
Name the physical quality which is measured in
(i) Kw (ii) kWh
1kWh = …….. J
A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the resistor will ______________ .
The diagram above shows a circuit with the key k open. Calculate :
(i) the resistance of the circuit when the key k is open.
(ii) the current drawn from the cell when the key k is open.
(iii) the resistance of the circuit when the key k is closed.
(iv) the current drawn from the cell when the key k is closed.
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.
Which material is the calorimeter commonly made of? Give one reason for using this material.
What would happen and why, to an electric bulb when it is connected across a supply of voltage (i) lower (ii) higher than its proper rating?
A bulb is connected to a battery of e.m.f. 6V and internal resistance 2Ω A steady current of 0.5A flows through the bulb. Calculate the heat energy dissipated in the bulb in 10 minutes.
