Resistors are electrical components that oppose the flow of either direct or alternating current. They are used to protect, operate, or control circuits.A resistor is a latent two-terminal electrical segment that actualizes electrical safety as a circuit component. Resistors act to decrease current stream, and, in the meantime, demonstration to lower voltage levels inside circuits. Resistors may have altered resistances or variable resistances, for example, those found in thermistors, varistors, trimmers, photoresistors, humistors and potentiometers.
A capacitor (originally known as a condenser) is a passive two-terminal electrical component used to store energy electrostatically in an electric field. The forms of practical capacitors vary widely, but all contain at least two electrical conductors (plates) separated by a dielectric (i.e., insulator). The conductors can be thin films of metal, aluminum foil or disks, etc. The 'nonconducting' dielectric acts to increase the capacitor's charge capacity. A dielectric can be glass, ceramic, plastic film, air, paper, mica, etc. Capacitors are widely used as parts of electrical circuits in many common electrical devices.
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor's terminals changes the current through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal. Today, some transistors are packaged individually, but many more are found embedded in integrated circuits.