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प्रश्न
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
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उत्तर
Given, current, I= 0.2 A; p.d. = 15 V
(i) A/C to Ohm's law
V=IR
R = `"v"/"I" = 15/0.2 = 75 Omega`
(ii) energy produced in one minutes is:
H=I2 Rt = (0.2)2 x 75 x 60 =180 J
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संबंधित प्रश्न
The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are as given below:
| V (volts) | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 4.0 | 5.0 |
| I (amperes) | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.8 | 1.0 |
Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.
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State whether a voltmeter has a high resistance of a low resistance. Give reason for your answer.
In the circuit shown below:
The potential difference across the 3 Ω resistor is:
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Write an expression for the electrical power spent in flow of current through a conductor in terms of resistance and potential difference.
A current of 0.2 A flows through a conducting wire for 5 minutes. How much charge will flow?
What is the measure of the work done on the unit positive charge to bring it to that point against all electrical forces?
Twenty-seven drops of the same size are charged at 220 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.
