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प्रश्न
A current of 0.8 A flows in a conductor of 40 Ω for 1 minute. The heat produced in the conductor will be ______.
विकल्प
1445 J
1536 J
1569 J
1640 J
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उत्तर
A current of 0.8 A flows in a conductor of 40 Ω for 1 minute. The heat produced in the conductor will be 1536 J.
Explanation:
From Ohm's law, we know that
V = IR
Given: I = 0.8 A, R = 40 Ω, t = 1 min (60 sec)
Now, V = I.R
V = 0.8 × 40
V = 32 volt
Power, P = V × I
P = 32 × 0.8
P = 25.6 watt
Heat = P × t
Heat = 25.6 × 60
Heat = 1536 J
संबंधित प्रश्न
Graph showing the variation of current versus voltage for a material Ga As is shown in the figure. Identify the region of
(i) negative resistance
(ii) where Ohm's law is obeyed.
What is Resistivity?
Fill in the following blank with suitable words:
Resistance is measured in .............. The resistance of a wire increases as the length ..............; as the temperature ..............; and as the cross-sectional area .............. .
In an experiment of verification of Ohm’s law following observations are obtained.
|
Potential difference V (in volt) |
0.5 | 1.0 | 1.5 | 2.0 | 2.5 |
| current I (in ampere) | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 |
Draw a V-I graph and use this graph to find:
- the potential difference V when the current I is 0.5 A,
- the current I when the potential difference V is 0.75 V,
- the resistance in a circuit.
A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross section, what will be its new resistance?
State the relation correlating the electric current flowing in a conductor and the voltage applied across it. Also, draw a graph to show this relationship.
SI unit of resistance is:
How is electric current related to the potential difference across the terminals of a conductor?
Draw a labelled circuit diagram to verify this relationship.
Why should an ammeter have low resistance?
