The Law of Ohm

The Law of Ohm says: The current in a circuit is directly proportional to the applied voltage and inversely proportional to the amount of resistance.
This means that if the voltage goes up, the current flow will go up, and vice versa. Also, as the resistance goes up, the current goes down, and vice versa.
The Law of Ohm can be put to good use in electrical troubleshooting. A more practical, less time-consuming use of The Law of Ohm would be to simply apply the concepts involved: 
SOURCE OF VOLTAGE is not affected by either current or resistance. It is either too low, normal, or too high, if it is too low, current will be low. If it is normal, current will be high if resistance is low or current will be low if resistance is high, if voltage is too high, current will be high.
CURRENT is affected by either voltage or resistance. If the voltage is high or the resistance is low, current will be high. If the voltage is low or the resistance is high, current will be low.
RESISTANCE is not affected by either voltage or current. It is either too low, okay, or too high, if resistance is too low, current will be high at any voltage, if resistance is too high, current will be low if voltage is okay.
Fast, accurate electrical troubleshooting is easy when you know how voltage, current, and resistance are related.
The Law of Ohm explains the relationship:

• Current (amps) equals voltage (volts) divided by resistance (ohms) ... I = E ÷ R.


• Voltage (volts) equals current (amps) Multiplied by resistance (ohms) ... E = I * R.


• Resistance (ohms) equals voltage (volts) divided by current (amps) ... R ÷ E = 1.

ELECTRIC POWER AND WORK

• Voltage and current are not measurements of electric power and work. Power, in watts, is a measure of electrical energy P = I * E.
  
• Work, in watt-seconds or watt-hours, is a measure of the energy used in a period of time ... work equals the power in watts (W) Multiplied by the time in seconds (s) or hours (h), W = P * time.
  
Electrical energy performs work when it is changed into thermal (heat) energy, radiant energy, audio energy, mechanical energy, and chemical energy. It can be measured with a watt*hour

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