*Physics*
*Answer the following questions:*
1. a) State ohm's law. Mention the factors on which the resistance of a conductor depend.
b) State Joule's law of heating and write mathematical formula of this law.
2. Explain the advantages and disadvantagea of solar cells.
Answers
Answer:
a) Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Therefore, V = RI where R is a constant called resistance. R depends on the dimensions of the conductor and also on the material of the conductor. Its SI unit is Ohm (Ω).
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Explanation:
1.a)Ohm's Law states that the current flowing in a circuit is directly proportional to the applied potential difference and inversely proportional to the resistance in the circuit. In other words by doubling the voltage across a circuit the current will also double
.The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.
b)A quantitative form of Joule's law is that the heat evolved per second, or the electric power loss, P, equals the current I squared times the resistance R, or P = I2R. The power P has units of watts, or joules per second, when the current is expressed in amperes and the resistance in ohms
2)Advantages of Solar Energy
Renewable Energy Source. Among all the benefits of solar panels, the most important thing is that solar energy is a truly renewable energy source. ...
Reduces Electricity Bills. ...
Diverse Applications. ...
Low Maintenance Costs. ...
Technology Development.
Disadvantages of solar cells
Cost. The initial cost of purchasing a solar system is fairly high. ...
Weather-Dependent. Although solar energy can still be collected during cloudy and rainy days, the efficiency of the solar system drops. ...
Solar Energy Storage Is Expensive. ...
Uses a Lot of Space. ...
Associated with Pollution6