An amp or ampere is a measure of the flow of charge in an electrical circuit. This flow is known as an **electrical current**. The vibrating electrons transmit energy through the circuit. There is some flow of electrons but this is relatively slight compared to the flow of energy or charge. The higher the current within the circuit, the greater the flow of energy. The flow of the current, measured with an ammeter, is related to both the **voltage **and to the **resistance** within the circuit. **Ohm’s Law **represents this relationship and states that the flow of charge, and therefore the amperes within a circuit, can be calculated as follows:

Resistance (R)