A circuit is a path through which electricity flows. It consists of a power source, such as a battery, wires to carry the electricity, and components, such as resistors, that use the electricity.
A resistor is an electronic component that resists the flow of electricity. It is used to control the amount of current flowing in a circuit and to reduce the voltage.
Resistors are important in circuits because they allow us to control the flow of electricity. Without resistors, too much current could flow through a circuit, potentially damaging components.
The resistance of a resistor is calculated using Ohm's Law, which states that resistance is equal to the voltage divided by the current. In other words, resistance (in ohms) = voltage (in volts) / current (in amps).
Resistors can be connected in series or in parallel in a circuit. In series, the resistors are connected one after the other, whereas in parallel, the resistors are connected to each other at both ends. The way resistors are connected affects the overall resistance in the circuit.