A few questions about electronics...

[watercooled]

Not sure if this is the right part of the forum to post this type of question, but I'm guessing it is...
Anyway, am I right in thinking that a DC circuit has no PF ie the VA and Watt values are equal? Also, a pure resistive load like an incandescent light bulb will have a PF of 1, right (on an AC circuit, of course)?

[Steve B]

yes to both

being slightly pedantic, the VA and Watt values are not _equal_ for a DC circuit as the VA value IS the Watts value.

[jamin]

Power factor applys to AC circuits only and is the ratio of real power to apparent power. You are confusing your equations mate....

[watercooled]

Thanks guys - that makes things clearer

[peterb]

The previous posts have answered the question, but post back if you want the maths behind it - there is only one equation - power-=V*I*PF, but in a steady state DC cct the PF is always =1 as there cannot be a reactive component.

[watercooled]

Does PF differ when more load is applied at certain parts of the wave than at others? I guess that in a pure resistive load the same load would be applied at all parts of the wave, right?