Advertisements
Advertisements
प्रश्न
An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater.
- How much charge flows around the circuit each second?
- How much energy is transferred to the heater each second?
Advertisements
उत्तर
Given: Potential difference = 230 V
Current (I) = 8 A
a. I = `Q/t``
⇒ 8 = Q/1
⇒ Q = 8 × 1
⇒ Q = 8C
Therefore, the charge that flows around the circuit every second is 8 C.
b. We know that,
Energy transferred = Work done
Potential difference = `"Work done"/"Charge moved"`
⇒ 230 = `"Work done"/8`
⇒ Work done = 230 × 8
⇒ Work done = 1840 J
Thus, 1840 joules of energy are transferred to the heater each second.
APPEARS IN
संबंधित प्रश्न
What is nichrome? State its one use.
Why is a series arrangement not used for connecting domestic electrical appliances in a circuit?
An electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find the energy consumed and the current drawn.
Why does the connecting cord of an electric heater not glow hot while the heating element does?
How much heat will an instrument of 12 W produce in one minute if it is connected to the heat produced by it?
Which of the following characteristic is not suitable for a fuse wire?
(a) thin and short
(b) thick and short
(c) low melting point
(d) higher resistance than rest of wiring
Identify the figure and give its use.
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.
Write the mathematical expression for Joule’s law of heating.
The ‘live’ and the ‘neutral’ wires have potential difference of _______.
In an electric bulb, coil of _______ metal is used.
Explain the heating effect of electric current.
Name any two appliances which work under the principle of heating effect of current.
Which of the following is correct?
A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of:
An electric cell produces electricity from the ______ ______ in it.
Can we use the same fuse in a geyser and a television set? Explain.
An electric fuse has a body made of ceramic and two points for connecting the fuse wire.
It would cost a man Rs. 3.50 to buy 1.0 kW h of electrical energy from the Main Electricity Board. His generator has a maximum power of 2.0 kW. The generator produces energy at this maximum power for 3 hours. Calculate how much it would cost to buy the same amount of energy from the Main Electricity Board.
Write an expression for the amount of heat produced in a resistor when an electric current is passed through it stating the meanings of the symbols used.
