Resistors are Electrical components that are used to reduce the amount of current in any circuit. Remember that in circuit we always want to reduce the amount of current and to keep it withing the rated limits. If resistors are not used then the working assembly (any thing on which we are performing experiment) will burn away.
The quantity used to identify this component is resistance. The more resistance a component has the less will be the amount of current flow.
So in any circuit we can use our desired amount based on the need of that experiment. The normal Engineering prefixes are used to denote the resistors.
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