A transistor is used to allow current to flow along one path. A transistor can tell which way the current is flowing and make decisions or add numbers. Resistors reduce the flow of a charge. Since some electronic components are very delicate, they can only have a little bit of charge flow through them. Resistors help solve the problem of voltage pressure by policing the processes.
Inductors act like res istors at certain frequencies.
They are neither conductors nor insulators but somewhere in between. Build a simple parallel circuit. Both light bulbs should be lit equally. Break the circuit to one of the lights and reconnect it with a resistor in the path. The resistance of an object is measured in Ohms.