Advertisements
Advertisements
प्रश्न
An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
Advertisements
उत्तर
Resistance of the electric heater, R = 8 Ω
Current I = 15 A
Time, t = 2 hr.
Rate of generation of heat = I2 × R
= (15)2 × 8
= 255 × 8
= 1800 W
Therefore, heat is produced by the heater at a rate of 1800 W.
APPEARS IN
संबंधित प्रश्न
State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?
Name any two effects of electric current.
The safety device based on the heating effect of electric current is called a ______.
Write Joule's law of heating.
Write down the formula for the heat produced when a current I is passed through a resistor R for time t.
A heating coil has a resistance of 200 Ω. At what rate will heat be produced in it when a current of 2.5 A flows through it?
Name the material which is used for making the filaments of an electric bulb.
The current passing through an electric kettle has been doubled. The heat produced will become:
(a) half
(b) double
(c) four time
(d) one-fourth
Which electric heating device in your home do you think have resistors which control the flow of electricity?
Give Scientific reason.
In practice, the unit kWh is used for the measurement of electrical energy, rather than joule.
Heat energy is being produced in a resistance in a circuit at the rate of 100 W. The current of 3 A is flowing in the circuit. What must be the value of the resistance?
Statement 1 : Electric current ( flow of electrons ) creates heat in the resistor.
Statement 2 : Heat in the resistor is created according to the rule of energy conservation.
Explain Statement 1 with the help of Statement 2.
Solve the following question.
Compute the heat generated while transferring 96000 coulombs of charge in two hours through a potential difference of 40 V.
What is a short circuit?
Explain the application of heating effect of electric current in an electric bulb with a diagram.
How does use of a fuse wire protect electrical appliances?
An electric component used as a safety device is electric circuit is ______.
An electric cell produces electricity from the ______ ______ in it.
Name a few appliances which work on the basis of the heating effect of current.
An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?
