That completely depends on the task that you want the resistor to perform,
and on where the 20 volts appears in the circuit.
what does a resistor in an ampliflyer circuit
how connect a variable resistor to circuit
if not disconnected you will measure the resistance of the circuit in parallel with the resistor.
Any part of a circuit that has a voltage drop across it is a resistor.
A resistor.
It is used to vary the voltage/current flow in a circuit.
Equivalent Resistor
resistor
a resistor
A resistor in a sensor circuit is used as a simple way to monitor the function of the circuit. The resistor has a calibrated and known voltage drop and current while the circuit is "normal". If there is a short-circuit, or an open-circuit, the voltage and current will change and trigger the trouble alarm.
A resistor designed to protect a circuit against overload.
A resistor is a device that impedes or limits the flow of electrical current in a circuit. It converts the current's electrical energy into heat (thermal) energy. A resistor reduces the amount of energy in a circuit and pumps it out as a heat.