Advertisements
Advertisements
प्रश्न
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?
विकल्प
1A
2A
4A
5A
Advertisements
उत्तर
5A
Explanation -
Power (P) = 1 kW = 1000 W
Potential difference (V) = 220 V
We know,
P = VI
`"I" = "P"/"V"`
`"I" = 1000/220`
I = 4.54 A
From all the given options, 5 A fuse wire is correct.
APPEARS IN
संबंधित प्रश्न
How does the resistance of a wire vary with its:
diameter?
The heat produced by passing an electric current through a fixed resistor is proportional to the square of:
(a) magnitude of resistance of the resistor
(b) temperature of the resistor
(c) magnitude of current
(d) time for which current is passed
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.
Write the mathematical expression for Joule’s law of heating.
Explain the importance/uses of fuse wire.
When a switch is in OFF position,
- circuit starting from the positive terminal of the cell stops at the switch.
- circuit is open.
- no current flows through it.
- current flows after some time.
Choose the combination of correct answer from the following.
What is an electric fuse made up of?
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.
State the law that explains the heating effect of current with respect to the measurable properties in an electrical circuit.
