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# Voltage question Watch

1. voltage.docx

I need help on both bi and biv. The mark scheme answers don't make sense for me and I need some explanations.

Thanks
2. Bump
3. Bulb 1 is at its rated value and the voltmeter is connected across it directly so it must read 12v.

12v + the PD across the resistor must add up to 15 (Kirchoff2) so the PD across the resistor must be 15-12 = 3v
4. (Original post by teachercol)
Bulb 1 is at its rated value and the voltmeter is connected across it directly so it must read 12v.

12v + the PD across the resistor must add up to 15 (Kirchoff2) so the PD across the resistor must be 15-12 = 3v
But the voltmeter is connected directly across lamp B as well as lamp A. This is so hard to understand for me .

Thanks
5. Lamp B has a resistor in series with it so the PD across this resistor + PD across lamp B is 12v

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