Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). Ohms are named after Georg Simon Ohm (1784-1854), a German physicist who studied the relationship between voltage, current and resistance.

Ohms Law and Power

1. To find the Voltage, ( V ) [ V = I x R ] V (volts) = I (amps) x R (Ω)
2. To find the Current, ( I ) [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)
3. To find the Resistance, ( R ) [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)
4. To find the Power (P) [ P = V x I ] P (watts) = V (volts) x I (amps)

Ohm’s Law and Resistance. Ohm’s law states that the voltage or potential difference between two points is directly proportional to the current or electricity passing through the resistance, and directly proportional to the resistance of the circuit.

The relationship between current, voltage and resistance is expressed by Ohm’s Law. 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 Voltage, Current and Resistance forms the basis of Ohm’s law. In a linear circuit of fixed resistance, if we increase the voltage, the current goes up, and similarly, if we decrease the voltage, the current goes down.

If a neutral object loses electrons, it becomes more positively charged. If a neutral object gains electrons, it becomes more negatively charged. Current is the rate of flow of positive charge. Current can be caused by the flow of electrons, ions or other charged particles.

The charge is the property of matter because of which the matter experiences the force of attraction or repulsion in an electric field. Whereas the current is the rate of flow of charged particles called electrons. The coulomb is the unit of electric charges, whereas the current is measured in the amperes.

1. The time rate of flow of electric charge, in the direction that a positive moving charge would take and having magnitude equal to the quantity of charge per unit time is called Current. The amount of electrical charge that moves in a circuit depends on the current flow and how long it flows for.

There are two kinds of current electricity: direct current (DC) and alternating current (AC). With direct current, electrons move in one direction. Batteries produce direct current. In alternating current, electrons flow in both directions.

An electric current is a flow of electric charge in a circuit. More specifically, the electric current is the rate of charge flow past a given point in an electric circuit. The charge can be negatively charged electrons or positive charge carriers including protons, positive ions or holes.

A Current Transformer (CT) is used to measure the current of another circuit. CTs are used worldwide to monitor high-voltage lines across national power grids. A CT is designed to produce an alternating current in its secondary winding that is proportional to the current that it is measuring in its primary.

ampere

Current is flow of electrons, but current and electron flow in the opposite direction. Current flows from positive to negative and electron flows from negative to positive. Current is determined by the number of electrons passing through a cross-section of a conductor in one second.

Since current can be the flow of either positive or negative charges, or both, a convention is needed for the direction of current that is independent of the type of charge carriers. The direction of conventional current is arbitrarily defined as the direction in which positive charges flow.

Voltage is the Cause, Current is the Effect Voltage attempts to make a current flow, and current will flow if the circuit is complete. It is possible to have voltage without current, but current cannot flow without voltage.

So the voltage of the neutral wire is always zero… If it’s not small enough to be ignored, it means that the neutral wire is too small (diameter) for the amount of current that it’s carrying. current flows because of voltage. Well, yes, but no.

It can’t flow “to” ground, because there is nowhere for it to flow to. There’s no difference between ground and a wire dangling in the breeze. Electricity flowing to ground in high voltage systems has nothing to do with the fact that they’re high voltage.

Electricity (whether it comes from lightning or any other source) heads to the ground as a result of some very basic forces. Basically, clouds filled with tons of negatively charged particles are attracted to the positively charged ground.

You can be shocked by electricity as long as you are part of a loop. Stick a 9V battery on your tongue while touching the ground, it will still shock you. The battery has positive and negative terminals and current will flow if there is a conductive path between the terminals, such as your moist tongue.