Advertisements
Advertisements
प्रश्न
Mark the correct choice
- Assertion: Electric appliances with a metallic body have three wire connections.
- Reason: Three-pin connections reduce the heating of the connecting wires.
विकल्प
if both the assertion and the reason are true and the reason is the correct explanation of the assertion.
if both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.
if the assertion is true, but the reason is false.
if the assertion is false, but the reason is true.
Advertisements
उत्तर
If the assertion is true, but the reason is false.
Correct Reason:
Three-pin connections to protect the electrical shock. Because appliances carry a high electric current.
APPEARS IN
संबंधित प्रश्न
Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?
Answer the following question:
what is the heating effect of the electric current? state any four applications of it?
What is used to turn off the sudden increase in current in the electrical circuit of the house nowadays?
Write scientific reason.
A coil made up of alloy Nichrome is used in the electric heater cooker as a resistor.
Name any two appliances which work under the principle of heating effect of current.
Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source.
- Will the bulb in the two circuits glow with the same brightness? Justify your answer.
- Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.
(a) Observe the diagram given below and state whether the bulb will glow or not when we switch on K.
(b) Is it safe to handle the bulb when the switch is OFF?
(c) Give a reason for your answer in (b).
An electric fuse has a body made of ceramic and two points for connecting the fuse wire.
______ wire is used in the filament of the bulbs.
What is the heating effect of electric current?
