Advertisements
Advertisements
प्रश्न
The current passing through a room heater has been halved. What will happen to the heat produced by it?
Advertisements
उत्तर
The heat produced by the room heater will become one-fourth the previous quantity when the current passing through it is halved because the heat produced is directly proportional to the square of the current.
APPEARS IN
संबंधित प्रश्न
What is nichrome? State its one use.
Give two reasons why nichrome alloy is used for making the heating elements of electrical appliances.
The elements of electrical heating devices are usually made of:
(a) tungsten
(b) bronze
(c) nichrome
(d) argon
Which electric heating device in your home do you think have resistors which control the flow of electricity?
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.
Why does tungsten metal used to make solenoid type coil in an electric bulb?
Name any six domestic appliances based on the heating effect of electric current.
How can overloading be avoided?
Explain the application of heating effect of electric current in an electric bulb with a diagram.
A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly:
The heating element of an electric iron is made up of:
Why is parallel arrangement used in domestic wiring?
What are the uses of electromagnets?
Name a few appliances which work on the basis of the heating effect of current.
The following is not a safety device.
A trip switch is a ______ safety device.
Explain why fuse wire is always connected in a series arrangement.
Define the following:
Electrolyte
Find the odd one out.
Anannya responded to the question: Why do electrical appliances with metallic bodies are connected to the mains through a three-pin plug, whereas an electric bulb can be connected with a two-pin plug?
She wrote: Three-pin connections reduce heating of connecting wires.
- Is her answer correct or incorrect? Justify.
- What is the function of a fuse in a domestic circuit?
