The document describes calculating the power balance of a circuit diagram with a closed LED light switch. It involves drawing the circuit, using a circuit analysis technique to calculate the power transferred from solar panels to a refrigerator, battery, and LED light, and using circuit simulation software to verify the calculations. The effectiveness of power transfer between components is also commented on.

1. a) Draw a circuit diagram of the system described above, with the LED light switch closed.
(b) Using a circuit analysis technique of your choosing, calculate the power balance of the
system. Show all working. Comment on the effectiveness of power transfer from the solar panels
to the refrigerator, battery, and LED light.
(c) Use circuit simulation software to verify your calculations in
6.9
a 27
b 7.5
c 1.2
d 0.17
e 13.2
f 7.5
g 6.9
Solution
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