I'm new to electronics and the forum so Hi all, I hope to be a useful member. I have questions for you high I.Q fellas here . please excuse my noob problems, I'm trying real hard.
A resistor voltage divider can step down a voltage for say 12v DC to 6v DC, but what resister values do I use? the current for the load say a 1Watt 6v bulb seems to generate a much higher current in the voltage divider series resistors than that of the bulb load circuit.
do resistors generate heat when reducing current, what I'm asking is am I draining a lot of power from the battery with resistors or are they just mostly dropping voltage?
how do coils work in lay-mans terms, here is what I know so far, they don't restrict DC, but oppose AC at higher frequencies, also they build an EMF field, I'm not bothered about formulas at the moment I'm looking at how they do what they do, what puzzles me is if a coil is in parallel with a capacitor what does the resonating achieve? does the DC just go straight through the coil?
I'm looking at a crystal AM radio set and the capacitor and coil resonate back and forth, the antenna acts as a capacitor , and the diode demodulates, but why is the coil actually needed? the antenna resonates with the radio waves, what use is the magnetic field in the coil? would the variable capacitor no work with the antenna without the coil? I can sort of think of the resonating as tuning to a frequency, but I cant see why ?
A resistor voltage divider can step down a voltage for say 12v DC to 6v DC, but what resister values do I use? the current for the load say a 1Watt 6v bulb seems to generate a much higher current in the voltage divider series resistors than that of the bulb load circuit.
do resistors generate heat when reducing current, what I'm asking is am I draining a lot of power from the battery with resistors or are they just mostly dropping voltage?
how do coils work in lay-mans terms, here is what I know so far, they don't restrict DC, but oppose AC at higher frequencies, also they build an EMF field, I'm not bothered about formulas at the moment I'm looking at how they do what they do, what puzzles me is if a coil is in parallel with a capacitor what does the resonating achieve? does the DC just go straight through the coil?
I'm looking at a crystal AM radio set and the capacitor and coil resonate back and forth, the antenna acts as a capacitor , and the diode demodulates, but why is the coil actually needed? the antenna resonates with the radio waves, what use is the magnetic field in the coil? would the variable capacitor no work with the antenna without the coil? I can sort of think of the resonating as tuning to a frequency, but I cant see why ?