1. A resistor has 2.0 A of current flowing through is when the potential diffenr

Question

1. A resistor has 2.0 A of current flowing through is when the potential diffenrence across it is 16.5V. When the potential difference is increased to 19.5V, the current increases to 5.5 A. What kind of material is this ?

2. A capacitor is connected in series with a 275 ohm resistor . when a switch is closed on a 1.50 V battery connected in series with these components, the capacitors potential difference increases to 0.875 V in 1.256 microseconds. What is the capacitors capacitance?

3. given a resistance of 5M,what capacitance value is required to have a time constant of 1s

Explanation / Answer

Solution:

1) We see that As potential difference is increased, Resistance keeps droping and current is increasing as expected therefore it Thin metal film resistor

2) we know V=Vo{1-e^-t/RC]

therefore by evaluating we got: C= 0.005216uC

3) t = RC

therefore C=0.2uC

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