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
The electrical resistivities of four materials P, Q, R and S are given below:
| P | `6.84xx10^8`Ωm |
| Q | `1.70xx10^8`Ωm |
| R | ` 1.0xx10^15`Ωm |
| s | `11.0xx10^-7`Ωm |
Which material will you use for making: (a) heating element of electric iron (b) connecting wires of electric iron (c) covering of connecting wires? Give reason for your choice in each case.
The ‘live’ and the ‘neutral’ wires have potential difference of _______.
Which of the following substance contracts on heating?
What is the heating effect of electric current?
Name some devices that run using heat effect of electric current
Which of the following gases are filled in electric bulbs?
Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit given in the following figure. The current flowing in both the circuits is the same.
- Will the heat produced in both cases be equal? Explain.
- Will the heat produced be the same if the wires taken by them are of equal lengths but of different thickness? Explain.
Name the effect of the current responsible for the glow of the bulb in an electrical circuit.
Name a few appliances which work on the basis of the heating effect of current.
An electric iron is rated 220 V, 2 kW. If the iron is used for 3h daily find the cost of running it for one week if it costs ₹ 4.25 per kWh.
