What is the difference between voltage and current?

Voltage is the electromotive force (the force to move electricity) that causes the electrons to move within a conductor. It is the force of attraction between the positive and negative charges. If there are electrons at one point of a circuit and the other point has lack of electrons then voltage of EMF is created that causes the electrons to flow towards the point that has a lack of electrons. Voltage is measured in volts and the symbol used for voltage is “V”. Measuring instrument used for it is “Voltmeter”.

Current is the rate of electron flow in a conductor. Mathematically current is a measurement of the electrons passing at any given point in the circuit in one second. The current can be measured and is dependent upon the EMF or voltage. The current will flow through a conductor whenever there is a potential difference between the two points in the conductor creating voltage. It is measured in units of amperes and symbol used for current is “I”. Measuring instrument used for it is “Ammeter”.

Relationship between Voltage and Current:

The voltage and current are related to each other by Laws of Electricity which are as follows:

Ohm's Law:

Ohm’s Law states that one volt of electromotive force is required to deliver one ampere of electric current when the electrical resistance is of one ohm.

Mathematically it can be expressed as      V = I R

Watt's Law:

Power is the rate of doing any work, so in electricity power is the rate of electric work. Watt’s Law expresses the relationship between Power, Voltage and Current. According to this law 1 watt is equal to 1 volt multiplied by one ampere

Mathematically it is expresses as      P = V I