Acell supplies a current 0.9a through a resistance of 2 ohms and a current of 0.3a through a resistance of 7 ohms. what is internal resistance

We model the cell's internal resistance as an additional resistor in the circuit. We will use V = IR to calculate the voltage drops over each resistor for both circuits.

Circuit 1: 0.9A current, internal resistance r, resistor 2Ω

V = 0.9r + 0.9(2) = 0.9r + 1.8

Circuit 2: 0.3A current, internal resistance r, resistor 7Ω

V = 0.3r + 0.3(7) = 0.3r + 2.1

Since V should be the same for both circuits, set the total voltage drops equal to each other and solve for r:

0.9r +1.8 = 0.3r + 2.1

0.6r = 0.3

r = 0.5Ω

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-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

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-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this

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