Auto transformer

Tong Tester

Earth leakage circuit breaker (ELCB)

Variac

Self induction

Mutual induction

Fleming's right hand rule

Same principle of D.C. motor

Set the tester in correct range

Make looping the conductor more than once through the core

Make sure the induction is at zero on the scale

Read the indicator position on the scale

Suitability for the type of load (inductive/capacitive/resistive)

PF range of meter (lagging/leading/unity)

Voltage and current range of meter suitable to load

Current and PF range of meter matching to load

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