To increase the current flowing in a circuit, the voltage must be increased, or the resistance decreased.Ī simple electrical circuit is depicted in Figure 1a.
Ohm’s Law: Current (I) = Voltage (V) / Resistance (R) This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit, provided the temperature remains constant. The relationship between current, voltage and resistance is expressed by Ohm’s Law. Resistance to alternating current is more properly called impedance but, in this application, resistance and impedance can be considered to be equivalent. The property of a material that limits current flow is known as its resistance (R), the unit of resistance is the ohm (Ω). The driving force (electrical pressure) behind the flow of a current is known as the voltage and is measured in volts (V) (Voltage may also be referred to as the potential difference, or electromotive force).
It is measured in amps (A) if the current is very small then it is described in milli-amps (mA), 1000 mA = 1A. The flow of electricity through an object, such as a wire, is known as the current (I).
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