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To determine the current through a resistor, you can use Ohm's Law which states that current (I) is equal to voltage (V) divided by resistance (R), or I = V/R.
The unit of measurement for current is ampere (A), often shortened to 'amps'.
In a series circuit, the total current is the same at every point, so to determine the total current, you can simply divide the total voltage by the total resistance.
In a parallel circuit, the current splits between resistors based on their individual resistances. To calculate the current through parallel resistors, you can use the formula I = V/R, where V is the total voltage and R is the individual resistance of the specific resistor you are calculating the current for.
The current through a resistor can change if the voltage or resistance in the circuit changes. However, in a simple circuit with a constant voltage and fixed resistances, the current through a resistor will remain constant.