Current Measurement
How to Measure Current
Current can be measured by adding an ammeter in path of electrical circuit.
Ammeter in Circuit Path
Probe Position
In above example to measure current we have cut the wire and pass through the Ammeter. In ammeter current sensor/Shunt is used to measure current.
Ammeter Connections
Right image show the probes position in current measurement. In current measurement ideal multimeter or ammeter acts as short circuit means no voltage drop occurs across connected probes.
Technical Note
In an ideal ammeter, the resistance is zero, which means it acts as a short circuit and does not affect the circuit being measured.
Key Points to Remember
- Current is always measured in series with the load
- The circuit must be broken to insert the ammeter
- Ammeter has very low internal resistance
- Select appropriate current range on the multimeter
- Observe proper polarity when connecting probes
- Ensure safety by turning off power before making connections
Types of Current Measurement
Direct Measurement
Using ammeter in series with the circuit
Indirect Measurement
Using clamp meter or current transformer