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प्रश्न
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उत्तर
We know that,
P=VI= I1R
Given, P = 1200 watt , I= 5A
R = `"P"/"I"^2 = 1200/(5 xx 5) = 48 Omega`
and, V = `"P"/"I" = 1200/5` = 240 V
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संबंधित प्रश्न
The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when:
a charge of 5 C passes through it?
Keeping the resistance constant, the potential difference applied across the ends of a component is halved. By how much does the current change?
A resistance of 20 ohms has a current of 2 amperes flowing in it. What potential difference is there between its ends?
How is the electric potential difference between the two points defined? State its S.I. unit.
Explain the analogy between the flow of charge (or current) in a conductor under a potential difference with the free fall of a body under gravity.
State whether the potential is a scalar or vector?
Three resistors are connected to a 12 V battery as shown in the figure given below:
(i) What is the current through the 8 ohm resistor?
(ii) What is the potential difference across the parallel combination of 6 ohm and 12 ohm resistor?
(iii) What is the current through the 6 ohm resistor?
100 J of heat is produced each second in a 4 Ω resistor. The potential difference across the resistor will be:
Name the instrument which is used to measure the potential difference.
What does the positive and negative sign of potential convey?
