Series Circuit Ohm’s Law

Ron Palmer College of Marin

By knowing any two of these quantities: Voltage, amps, or ohms, it is possible to easily determine the third. This done mathematically by the use of Ohm’s Law.Early in the 19th century, George Simon Ohm proved by experiment, a very precise relationship exists between voltage, current, and resistance. This relationship is called Ohm’s Law.

Ohm’s Law states that if any two values are known about a circuit, the third can be easily calculated

Voltage, Current, and Resistance

When one volt is applied to a circuit with one ohm of resistance, a current of one ampere will flow.

You can use Ohm’s Law to Solve electrical problems

CURRENT is affected by either voltage or resistance. If voltage is low or resistance is high, current will be low. If voltage is high or resistance is low, current will be high.

SOURCE VOLTAGE is not affected by current or resistance. It is either too high, okay or too low. If voltage is too high, current will be high. If it is okay, current will be high if resistance is low; or current will be low if resistance is high. If voltage is too low, current will be low.

RESISTANCE is unaffected by either current or voltage. It is either too high, okay, or too low. If it is too high, current will be low if voltage is okay. If it is okay, current will be high or low if voltage is high or low. If resistance is too low, current will be high if voltage is okay.

Ohm’s Law, Current Vs. Resistance

A series circuit is a circuit in which the devices that use the current are connected end-to-end so the same current flows through each component.

The current flowing in the circuit is the same at every point.

Individual resistances will add up to the total circuit resistance.

The sum of the individual voltage drops equals the applied voltage for the circuit

Voltage at the grounded side will be zero, which means the load used all the voltage.If the ground is removed, voltage will appear at the previously grounded side of the load.

To measure voltage, the meter (V) is placed across the load.

To measure current, an ammeter (A) is placed in series in the circuit. Polarity (+ and -) of the meter leads must be correct.

To measure resistance, an ohmmeter ® is placed across the load with power removed from the circuit.

Series Circuit Ohm’s Law

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