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Answers
1. This means that if the voltage is high the current is high, and if the voltage is low the current is low. Likewise, if we increase the resistance, the current goes down for a given voltage and if we decrease the resistance the current goes up.
2. When the resistance is 0 there’s no need of a “potential difference”. The current doesn’t need that “push(potential difference/voltage)” when there’s no opposition(resistance) in the circuit. E.g: we need to throw/push(voltage) the ball(current) upwards to make it go up because there’s gravity(resistance) which is pulling it down. But if there’s no gravity(0 resistance) we won’t need to push(voltage) the ball(current) as it would flow on it’s own. Just an analogy to make you understand.
Hence the current will be maximum and the voltage will be 0 in case of a short-circuit when the resistance almost goes down to 0. I repeat “almost”. Resistance can never be 0 though.
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