Soft iron

Rolled steel

Copper alloy

Cold rolled grain oriented

Ratio test

Impulse test

Short circuit test

Open circuit test

To reduce the constant losses

To reduce electric interference

To increase the quality of sound

To increase the efficiency of receivers

10⁶ Farad

10¹² Farad

10^-6 Farad

10^-12 Farad

Dielectric

Capacitance

Stray capacitance

Capacitive reactance