Voltage, Current, and Resistance

Voltage, current, and resistance are all terms used in electricity. Voltage is the force that is moving the electrons along the circuit. Current is the amount of electrons moving in a circuit. Resistance is the force acting against the current in circuits. Voltage is measured in volts (V), current is measured in amps (I), and resistance is measured in ohms (Ω). These terms all impact each other, as shown by this image to the right -->.
The Voltage is pushing the current through the circuit and the resistance is limiting the amount of current that can get through.


There are two laws that apply to this, Ohm's Law and Kirchhoff's Law. Ohm's Law states that Current (I) = Voltage (V) x Resistance (Ω).
If you know 2 of the 3 values, you can solve for the third by using Ohm's Law. Say you wanted to find resistance in a circuit. If you had 50 amps and 25 Volts the resistance would be 2 ohms. By doing 50= 25x ( in this case X is resistance) you could easily find resistance, which is 2 ohms.
Kirchhoff's Law states that the voltage dropped at each resistor equals the total voltage of that circuit from the power supply. Click here to see some examples and a better explanation of the Law,