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1) A filament is made of aluminum with a cross-sectional area of 5.25 X 10-4 m2...

1) A filament is made of aluminum with a cross-sectional area of 5.25 X 10-4 m2 and a length of 55 km. What is its resistance?

2) A circuit consists of a battery connected to three resistors (85ohms, 135ohms, and 215ohms) in parallel. THe total current through the resistors is 2.8 A. Find a) the emf of the battery and b) the current through each resistor. If the same resistors are connected in series with a 120v battery, what is c) the current that flows through the battery and d) the potential difference across each resistor.

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-2.3 13y 215 201s 2 2.8· 2.8A 12e 23 4SV

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