The specifications
BR2 | BR3 | |
Resistance | 0.5 to 0.7R | 1.5 to 1.7R |
Measured Resistance Values
The value of BR2 is 1.0R-0.2R=0.8R
The value of BR3 is 2.1R-0.2R=1.9R
Measuring Current Draw and Voltage Drop
1. Wire up a ballast resistor in series with your coil primary winding values as show in the following diagram.
2. Connect an ammeter in series and note the current draw.
3. Measure the note the voltage drop across the ballast resistor.
4. Measure the note the voltage drop across the coil primary.
The current in the series circuit |
The voltage across the coil |
The voltage across the ballast resistor BR3 |
Current | Voltage across the coil | Voltage across the ballast resistor BR3 |
3.57A | 5.27V | 6.15V |
Calculation
Rt=Rcoil + Rbr3= 1.4 + 1.9=3.3R
I=V/R=12V/3.3R=3.6A
Vcoil=IR=3.6A x 1.4R=5.04V
Vbr3=IR=3.6A x 1.9R=6.84V
The calculated values are close to the measured results. Because the power supply is close to 12V.
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