Electrical units refresher: In SI units, electric current is measured in which unit?

Introduction / Context:
A quick review of SI electrical units helps avoid confusion during troubleshooting and measurement. Technicians must correctly select the meter function and range for current, voltage, resistance, and capacitance to obtain valid readings and prevent damage.

Given Data / Assumptions:

• We are identifying the SI unit of electric current.
• Basic electrical quantities: voltage (V), current (I), resistance (R), capacitance (C).
• Common units: volt, ampere, ohm, farad.

Concept / Approach:

The ampere (amp) is the SI base unit for electric current. Voltage is measured in volts, resistance in ohms, and capacitance in farads. Correct unit recognition ensures proper meter usage: current requires placing the meter in series with the circuit and moving the probe to the current jack with an appropriate fuse rating.

Step-by-Step Solution:

Verification / Alternative check:

Any physics or electronics reference lists ampere as the unit of current; meter front panels label current ranges as A or mA.

Why Other Options Are Wrong:

• Volts: unit of electric potential difference.
• Ohms: unit of resistance.
• Farads: unit of capacitance.
• Diodes: a component, not a unit.

Common Pitfalls:

Placing a meter across a source on the amps range (short-circuit risk); forgetting to move the probe back from the current jack after measurement.

Final Answer:

amps