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प्रश्न
State the law that explains the heating effect of current with respect to the measurable properties in an electrical circuit.
उत्तर
Joule's law of heating states that the heat dissipated across a resistor is directly proportional to:
- The square of the current flowing through it.
- The resistance of the conductor.
- Duration of the flow of current.
H = `"I"^2 "Rt"`
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संबंधित प्रश्न
Why are the coils of electric irons and electric toasters made of an alloy rather than a pure metal?
How does the resistance of a wire vary with its:
diameter?
What is meant by the heating effect of current? Give two applications of the heating effect of current.
The heat produced in a wire of resistance 'x' when a current 'y' flows through it in time 'z' is given by:
(a) x2 × y × z
(b) x × z × y2
(c) y × z2 × x
(d) y × z × x
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.
Why does tungsten metal used to make solenoid type coil in an electric bulb?
Rewrite the following statement by selecting the correct option:
1 A = ____________ mA.
Explain the working of an electric fuse.
______ wire is used in the filament of the bulbs.
An electrochemical cell converts ______ energy into ______ energy.
