Associate
- Joined
- 5 Apr 2008
- Posts
- 1,526
Hi guys...
heres the question...
In use, A potential divider becomes hot and its resistance increases from 10 to 11 K Ohms. If the input p.d is 2V, show that the current though it changes by 0.02mA. Explain why, if the sliding contact stays in the same place, the output p.d does not change.
Now... ive found that the current decreases by 0.02mA when the resistance increases from 10 K Ohms to 11 K Ohms...
Firstly... Why does the temperature rise? Id always thought that an increase in current results in a higher temperature, but here the current is decreasing and the temperature is rising?
Secondly... Why is the sentence in Red the case?
Thanks!
heres the question...
In use, A potential divider becomes hot and its resistance increases from 10 to 11 K Ohms. If the input p.d is 2V, show that the current though it changes by 0.02mA. Explain why, if the sliding contact stays in the same place, the output p.d does not change.
Now... ive found that the current decreases by 0.02mA when the resistance increases from 10 K Ohms to 11 K Ohms...
Firstly... Why does the temperature rise? Id always thought that an increase in current results in a higher temperature, but here the current is decreasing and the temperature is rising?
Secondly... Why is the sentence in Red the case?
Thanks!