GarethB84
Sep3-08, 01:24 PM
Hi this is my first post so please be nice :)
1. The problem statement, all variables and given/known data
The problem has been set up that a circuit containing a resistor and switch is being driven by a power source of unkown potential. The switch is flick to short the power source leaving only the resistor in a closed loop.
Calculate the current decay.
Initial current = 100A
Resistance = 1n\Omega
2. Relevant equations
V=IR
Power = I2R
3. The attempt at a solution
I'm not too sure. The power generated, and hence the heat loss can be found to be 1e-5W so thats 1e-5 Joules per second of heat loss.
I'm not sure if we have enough information. Current decay involving inductance or capacitance is well known but just a resistor in a circuit of 'ideal' conductors?
I'm assuming it is an exponential decay of form I=I0e-t/\tau but finding the decay constant is proving tricky. Any advice????
Thanks in advance.
1. The problem statement, all variables and given/known data
The problem has been set up that a circuit containing a resistor and switch is being driven by a power source of unkown potential. The switch is flick to short the power source leaving only the resistor in a closed loop.
Calculate the current decay.
Initial current = 100A
Resistance = 1n\Omega
2. Relevant equations
V=IR
Power = I2R
3. The attempt at a solution
I'm not too sure. The power generated, and hence the heat loss can be found to be 1e-5W so thats 1e-5 Joules per second of heat loss.
I'm not sure if we have enough information. Current decay involving inductance or capacitance is well known but just a resistor in a circuit of 'ideal' conductors?
I'm assuming it is an exponential decay of form I=I0e-t/\tau but finding the decay constant is proving tricky. Any advice????
Thanks in advance.