PREVIOUSLY ASKED IN:
WBPSC Miscellaneous Preliminary 2023
Answer
Ampere
Explanation
The SI unit of electric current is the 'Ampere' (symbol: A). It is named after the French mathematician and physicist André-Marie Ampère, considered the father of electrodynamics. One ampere is defined as one coulomb of electrical charge flowing past a specific point in one second.
Key Points
- > Current is measured using a device called an Ammeter.
- > Ampere (A) is one of the seven SI base units.
- > Volt (V) is the SI unit of potential difference (Voltage).
- > Coulomb (C) is the SI unit of electric charge.
- > Ohm (\\( \\Omega \\)) is the SI unit of electrical resistance.
- > Watt (W) is the SI unit of electrical power.
- > Formula: \\( I = \\frac{Q}{t} \\) (Current = Charge / Time).
Additional Information
Electrical SI Units
| Physical Quantity | SI Unit | Symbol |
|---|---|---|
| Electric Current | Ampere | \\( A \\) |
| Electric Charge | Coulomb | \\( C \\) |
| Potential Difference | Volt | \\( V \\) |
| Resistance | Ohm | \\( \\Omega \\) |
Memory Tips
- Connect Ampere with the Amplifier that boosts the electrical signal.