Q:

# When do you need to use Ohm's law?

A:

Ohm's law is mainly used when building electrical devices to determine the amount of resistance needed to establish a certain current with a certain amount of voltage. Without Ohm's law, the circuit may have too much or too little current or voltage.

## Keep Learning

Resistance and resistors limit the amount of current traveling through a circuit, therefore establishing certain levels of voltage. Most appliances need a certain amount of voltage to properly operate, and Ohm's law helps you maximize the efficiency of the machine by not producing excess voltage. Ohm's law mainly calculates resistance, but it may also be rearranged and used to calculate the voltage or current a given resistance produces.

Sources:

## Related Questions

• A: Ohm's law was discovered and named by Georg Simon Ohm, a German physicist, in the 1820s. The discovery was published in his pamphlet, "The Galvanic Circuit... Full Answer >
Filed Under:
• A: Neither a voltmeter nor an ammeter measures resistance directly; a voltmeter measures voltage and an ammeter measures amperage or current. However, using O... Full Answer >
Filed Under:
• A: Some of the basics of electrical engineering are current, voltage and resistance. These are three of the essential building blocks of electricity, and it i... Full Answer >
Filed Under:
• A: The equation for voltage can be written as the current multiplied by the resistance. Voltage is defined as the electric potential energy at a given point i... Full Answer >
Filed Under:
PEOPLE SEARCH FOR