What is the correct calculation for resistance when the current is 4 amps and the voltage is 24 volts?

a) 24 volts - 4 amps = 20 ohms

b) 24 volts + 4 amps = 28 ohms

c) 24 volts * 4 amps = 96 ohms

d) 24 volts : 4 amps = 6 ohms

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