What do you mean by "a -10V supply"?
Draw your circuit. Choose which point you want to be 0V. Mark up the potential of the other supply terminal. Apply Ohm's Law.
I presume you have a power supply with a 10 Ohm resistor across it's terminals. Choose one power supply terminal to be at 0V...
You can put 0V anywhere you like in your circuit. The potential that you choose for 0V need not be the same potential that someone else chooses to be 0V in their circuit. When I teach this, I get a pupil to come and stand at the front of the class. I then take a 30m tape measure and declare that...
The reason why we use potential rather than energy is that we are able to measure potential, but measuring energy is problematic. If you try and measure energy, then you get noise from thermal effects, mechanical effects etc. It's a bugger to do, ask any microwave engineer. It's much easier to...
The battery has one terminal at a potential that is higher than the other. What's happening here? Chemical reactions are due to the exchange of electrons between chemicals. When this results in one chemical gaining an excess of electrons and the other a deficit, then a potential difference will...