Question

why is combined resistor in electric circuit

Answer 1

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Answer 2

The role of the resistor in an electrical circuit:NOTE: Diagrams, links and practice questions in this document are still to be added: In direct current (DC) or alternating current (AC) electrical circuits that have a resistor, as its name implies, resists the flow of electrons. It is one of the most basic of electrical components. It can be used to reduce the available voltage or current present in a circuit. While there are differences in how a resistor affects the two different types of current sources (DC or AC), depending on how the resistor is constructed and the AC frequency involved, it can be assumed that the following applies equally to both. For AC circuits it may be necessary to indicate how the voltage is represented, the average value, the peak value or the root mean square (RMS). If no indication is made of the type of AC voltage it is generally assumed to be the (RMS) value

As discussed in the Ohm's Law section, in an electrical circuit, voltage (measured in volts and denoted by the letter V) equals current (measured in amps and denoted by the letter I) multiplied by the resistance (measured in ohms and denoted by the letter R) present in the circuit. This is represented by the following formula.

V = IR or E = IR (Ohm's law)