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I always fail to get the concepts down or not fully state the concepts, so I would appreciate it if someone reviewed my understanding of these concepts and point of the places where I'm not getting the right idea or almost got the right idea but not completely.

1. What is wrong with this: "If current is used up going through a resistor & in a the resistor there is a constant potential difference , so why is the resistance on the resistor constant?"

Current can never be used up. Resistance is constant in a resistor because the same current always flow in the circuit.

2. If current is not used up, then what is? (we pay for electricity for some reason)

I got somewhat confused on this. Don't we pay for electricity because it's difficult to generate electricity and maybe resistance could have something to do with it? I really can't think of anything that could be used up.

3. Battery terminals have to be connected together for current to flow, why?

the terminals have to be connected, so it can be a closed circuit where current can flow from the battery and back to the battery and get sent out again in a cycle.

1. What is wrong with this: "If current is used up going through a resistor & in a the resistor there is a constant potential difference , so why is the resistance on the resistor constant?"

Current can never be used up. Resistance is constant in a resistor because the same current always flow in the circuit.

2. If current is not used up, then what is? (we pay for electricity for some reason)

I got somewhat confused on this. Don't we pay for electricity because it's difficult to generate electricity and maybe resistance could have something to do with it? I really can't think of anything that could be used up.

3. Battery terminals have to be connected together for current to flow, why?

the terminals have to be connected, so it can be a closed circuit where current can flow from the battery and back to the battery and get sent out again in a cycle.

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