PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoElectric current or simply current (\(I\)) is the rate at which charges flow past a point on a circuit.
Flow of charges in a wire
The value of current can be measured and expressed numerically. The SI unit for current is the ampere, and it is denoted as '\(A\)'. The formula is given as,
Where '\(I\)' is current, '\(t\)' is the time and '\(q\)' is the amount of charge flowing through the cross-section of a wire in time (\(t\)).
One ampere (\(1\ A\)) is defined as one coulomb (\(1\ C\)) of charge passing through a cross-section of a wire every one second (\(1\ s\)).
Mathematically,
Other units of ampere:
There are some other units of ampere listed in the table below.
Units | Symbols | In ampere |
kiloampere | \(kA\) | \(10^3 A\) |
Megaampere | \(MA\) | \(10^6 A\) |
milliampere | \(mA\) | \(10^{-3} A\) |
microampere | \(\mu A\) | \(10^{-6} A\) |
Measuring device:
An ammeter is a device that measures the strength of the electric current in an electric circuit.
An ammeter
Ammeter is always connected in series in a circuit. The current enters the ammeter by the positive (\(+\)) red terminal and exits through the negative (\(–\)) black terminal.
Ammeter connection in a circuit with diagram
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