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प्रश्न
Conceptual question.
Does a solar cell always maintain the potential across its terminals constant? Discuss
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उत्तर
A solar cell does not always maintain a constant potential difference across its terminals.
Its voltage depends on the intensity of sunlight, temperature, and the load connected to it. In strong light and with a light load, the terminal voltage is high. When the light intensity decreases or when a heavy load is connected, the voltage drops. Thus, unlike a battery, a solar cell cannot maintain a constant potential difference under all conditions.
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संबंधित प्रश्न
The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below:
| I (amperes) | 0.5 | 1.0 | 2.0 | 3.0 | 4.0 |
| V (volts) | 1.6 | 3.4 | 6.7 | 10.2 | 13.2 |
Plot a graph between V and I and calculate the resistance of that resistor.
A battery of emf 12 V and internal resistance 2 Ω is connected with two resistors A and B of resistance 4 Ω and 6 Ω respectively joined in series.
Find:
1) Current in the circuit
2) The terminal voltage of the cell
3) The potential difference across 6Ω Resistor
4) Electrical energy spent per minute in the 4Ω resistor.
Calculate the work done in moving a charge of 4 coulombs from a point at 220 volts to another point at 230 volts.
The device used for measuring potential difference is known as:
The other name of potential difference is:
Why do electricians wear rubber hand gloves while working with electricity?
b. The values of potential difference V applied across a resistor and the correponding values of current I flowing in the resistor are given below:
| Potential difference, V (in volts) | : | 2.5 | 5.0 | 10.0 | 15.0 | 20.0 | 25.0 |
| Current, I (in amperes) | : | 0.1 | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 |
Plot a graph between V and I, and calculate the resistance of the resistor.
c. Name the law which is illustrated by the above V-I graph.
The device used for measuring potential difference is
Suppose there are three resistors A, B, and C having resistances r1, r2, and r3 respectively. If R represents their equivalent resistance, establish the following relation `1/"R" = 1/"r"_1 + 1/"r"_2 + 1/"r"_3`, when joined in parallel.
100 J of heat is produced each second in a 4 Ω resistor. The potential difference across the resistor will be:
