Answer:
Units used for measurement of electrical quantities voltage, current and power are Volt, Ampere and Watts.
Solution:
Electric current is the rate of change of charge with respect to time,
i=dq/dt
The electrical unit used for measuring current is called Ampere,
1 Ampere= 1 coulomb/sec
Current --- Ampere (A)
Voltage is the energy required to move a unit charge through an element. So, the voltage between two terminals is named A, and B is the energy required to move a test charge between these terminals.
VAB=dW/dq
and the electrical unit used to measure the voltage is Volt.
1 Volt=1joule/coulomb
Electric power is the rate at which an element absorbs energy with respect to time.
P=dW/dt=dW/dq×dq/dt=V×I
And unit used to measure power is Watt.
And some standard electrical units are mentioned below,
Electrical parameter | Unit used for measuring | equation |
Charge | Coulomb (C) | |
Current | Ampere (A) | i=dq/dt |
Voltage | Volt (V) | V=dW/dt |
Power | Watts (W) | P=V.I |
resistance | Ohm | R=V/I |
Conductance | Siemen (S) | G=I/V |
Inductance | Henry (H) | v=L.(di/dt) |
Capacitor | Farad (F) | C=q/v |
Impedance | Ohm | Z=√R2+X2 |
Frequency | Hertz (Hz) | f=1/T |
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