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Use Ohm's Law to calculate the following:
a) The voltage required to produce a current of 2A in a 12ohms resistor.
b) The voltage required to produce a current of 0.1A in a 200ohms resistor.
c) The current produced when a voltage of 12V is applied to a 10ohms resistor.
d) The current produced when a voltage of 230V is applied to a 10ohms resistor.