BASIC DEFINATION

1) CURRENT = CURRENT IS NOTHING BUT THE FLOW OF FREE ELECTRON IN THE CIRCUIT IN THE CLOSED PATH. THE UNIT OF CURRENT IS MILLI AMPERE AND AMPERE AND IS DENOTED BY CAPITAL I.

2) VOLTAGE = Voltage is what makes electric charges move. It is the 'push' that causes charges to move in a wire or other electrical conductor. It can be thought of as the force that pushes the charges, but it is not a force. Voltage can cause charges to move, and since moving charges is a current, voltage can cause a current.
generally measure by voltmeter and denoted by capital V.

There are two types of voltage, DC voltage and ACvoltage. The DC voltage (direct current voltage) always has the same polarity (positive or negative), such as in a battery. The AC voltage (alternating current voltage) alternates between positive and negative. For example, the voltage from the wall socket changes polarity 60 times per second (in America). The DC is typically used for electronics and the AC for motors.

3) FREQUENCY = FREQUENCY IS DEFINED AS THE FLOW OF NUMBER OF AC CYCLE PER SECOND . IT IS CALCULATED IN HEARTZ AND IS DENOTED BY Hz.

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