Ohm\'s law Paul MacAlevey © Spring 2016 PRE-LAB Course & Section NAME Feel free

Question

Ohm's law Paul MacAlevey © Spring 2016 PRE-LAB Course & Section NAME Feel free to draft your answers in pencil but remember that the report to be given to your TA must be in pen. Someone says: Someone says: "Current is used up as it moves through a resistor. The potential difference across the resistor is kept the same and R. Thus the resistance of the resistor can't be constant". These statements can't all be true. What is wrong? Explain. 12] (All wires are assumed to be ideal.) 2 12 4 6 10 3 Find the resistances between the following; (If you use any equations then write them with your answer.) A and B E and D C and B (Give your reasoning for this one.) 12] 12

Explanation / Answer

here,

a)

the resistance of the resistor is constant

but current is directly proportional to the applied voltage

as the voltage changes , the current will also changes and vice versa

b)

the resistance between A and B is 2 ohm

c)

the resistance between E and D is 3 ohm

d)

the resistance between C and B be r

as 6 ohm , 12 ohm and 4 ohm resistances are in parallel

1/r = 1/6 + 1/12 + 1/4

r = 2 ohm

the resistance between C and B is 2 ohm

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