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प्रश्न
What material is used for making wire to prepare heating coils? Give a reason.
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उत्तर
Nichrome is used for making wire to prepare heating coils. The reason is that its melting point is high and its resistivity is also high.
संबंधित प्रश्न
A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω and 12 Ω, respectively. How much current would flow through the 12 Ω resistor?
An electrical appliance has a resistance of 25 Ω. When this electrical appliance is connected to a 230 V supply line, the current passing through it will be:
(a) 0.92 A
(b) 2.9 A
(c) 9.2 A
(d) 92 A
How does the presence of impurities in a metal affect its resistance?
State how are the two resistors joined with a battery when same current flows in each resistor.
When do you say that the resistors are connected in this way? Draw a circuit diagram.
State expression for Cells connected in parallel.
Write an expression for calculating electrical power in terms of current and resistance.
Four resistances of 2.0Ω each are joined end to end, to form a square ABCD. Calculate the equivalent resistance of the combination between any two adjacent comers.
The resistance of two resistors joined in series is 8Ω and in parallel is 1.5Ω. Find the value of the two resistances.
