If you measure zero current, then there are two possibilities,
and there's no way you can tell which one is true without
another measurement.
-- The voltage across the circuit may be zero,
and the resistance could be anything.
-- The resistance of the circuit may be infinite,
and the voltage could be anything.
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If the current is 0, then the resistance does not matter since there is no flow of current. In this case, Ohm's Law (V = IR) is not applicable because there is no current to interact with the resistance.
If resistance goes up in a circuit, the current will decrease. This is because Ohm's Law states that current is inversely proportional to resistance, meaning that as resistance increases, current decreases.
"Opposition to current" can refer to resistance, reactance, or impedance.
Resistance in an electric circuit is the opposition to the flow of electric current. It is measured in ohms. Resistance affects the flow of current by reducing it, as higher resistance leads to lower current flow. This relationship is described by Ohm's Law, which states that current is inversely proportional to resistance in a circuit.
Ohm's Law: voltage = current * resistance. If resistance is a constant, then voltage is directly proportional to current.
Ohm's Law states that the relationship between resistance, current, and voltage is given by the equation V IR, where V is the voltage, I is the current, and R is the resistance. This means that for a given voltage, the current flowing through a circuit is inversely proportional to the resistance - as resistance increases, current decreases, and vice versa.