>>11117794>capacitorscaps are like an open to DC, because capacitors are literally a break in the circuit. an ideal cap gets filled with electrons until it's fully charged, doesn't let any through, and can't accept any more.
but with AC, you are alternating between charging the cap from one side, then discharging it from the other side. so the electrons are basically going through it (in two steps).
>inductorsinductors are like an open to AC, because of lenz's law. it's the CHANGE in current that induces a field that blocks the flow of incoming electrons. since AC is always changing, that field will always exist.
but in DC, the current is constant (i.e. not changing), so the field doesn't exist. so the electrons are free to flow and inductor acts like nothing more than a wire.
>current is measured across a resistorfrom your perspective, it's voltage, not current, that is measured across a resistor. to measure current you have to put the meter inside the circuit, not across a resistor.
yes, technically the way an ammeter works is by measuring the voltage across an internal resistor of a known value inside the ammeter, then inferring current from that (because R is known, V is measured, and then current is calculated by I=V/R), but even knowing this, it's not current that is actually measured.
