Simple electrical circuits

Let take a look at some simple electrical circuits

When a battery is connected in series to an electric circuit with a switch and a light bulb, a chemical reaction between the negative terminal and an electrolyte creates a current. This current travels round the circuit and returns to the battery at the positive electrode. This current turns the light bulb on.

Electric current is a flow of electric charge or the rate of flow of electric charge and the path of electricity. The unit of current is the ampere (A). We use Ammeter to measure current. Ammeter is connected in series as the following schematic and current is the same at all point in series circuits

simple electric circuit

Ampacity is the current-carrying capacity of conductors or equipment, expressed in amperes.

Ampere-hour (Ah) is the quantity of electricity or measure of charge. (1 Ah = 3600 C [Coulomb])

Voltage is the effective (rms) potential difference between any two conductors or between a conductor and ground. The unit of voltage is V. We use Voltmeter to measure voltage.
R is resistance measured in ohms

Ohm's law defines the relationship between voltage,current, and resistance.

Ohm's Law

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