The current flowing through a circuit depends upon the resistance it meets.
Our world is full of electrical and electronic equipment, from huge and complex systems that control space missions down to a single light-emitting diode (LED) soldered to a battery. Regardless of the size or complexity of a circuit, the math must balance. The voltages must be correct, with neither too much nor too little current. Mistakes may render the entire circuit useless. A set of equations derived from Ohms Law enables the current, voltage or resistance to be mathematically determined at any point in a circuit.
Instructions
1. Substitute the resistance and the voltage values into the Ohms law equation, current = voltage / resistance. For example:
If the voltage is 12 volts and the resistance is 100 ohms, the equation becomes current = 12 / 100
2. Solve the equation to find the current, measured in amps. For example:
If the current = (12/100) amps this resolves to current = 0.12 amps.
3. Convert amps to milliamps by multiplying by 1,000, the number of milliamps in 1 amp. (Reference 3) The result is the original value in ohms converted to milliamps. Completing the example:
0.12 amps is equivalent to 120 milliamps because 0.12 x 1,000 = 120.
Tags: current amps, current voltage, current voltage resistance, voltage resistance
