# What is a resistor and how does it work?

Devices called

**resistors**let us introduce precisely controlled amounts of**resistance**into electrical circuits. Photo: Four typical**resistors**sitting side by side in an electronic circuit. A**resistor works**by converting electrical energy into heat, which is dissipated into the air.A.

### What is resistor and its uses?

A

**resistor**is an electrical component that limits or regulates**the**flow of electrical current in an electronic circuit.**Resistors**can also be used to provide a specific voltage for an active device such as a transistor.#### What kind of materials are used in resistors?

resistors are made from small rods of**ceramic coated**with metal such as a nickel alloy or a metal oxide such as tin oxide. The value of resistance is controlled by the thickness of the coating layer; the thicker the layer, the lower the value of resistance.#### What is a resistor and how does it work?

Devices called**resistors**let us introduce precisely controlled amounts of**resistance**into electrical circuits. Photo: Four typical**resistors**sitting side by side in an electronic circuit. A**resistor works**by converting electrical energy into heat, which is dissipated into the air.#### What is the use of a fixed resistor?

A**resistor**is used to reduce the flow of electricity in an electric circuit.**Resistors**come in**fixed**or variable types. A**fixed resistor**cannot be changed as it is set at a specific value, whereas a variable**resistor**can manage flows at and below a specific level.

B.

### What is the importance of a resistor?

The main function of

**resistors**in a circuit is to control the flow of current to other components. Take an LED (light) for example. If too much current flows through an LED it is destroyed. So a**resistor**is used to limit the current.#### Do resistors add or reduce voltage?

**Voltage**varies directly with current. "R" is the constant of proportionality telling how much it varies. If I add in a**resistor**to a circuit, the**voltage**decreases. If you have a**resistor**in a circuit, with a current flowing through it, there will be a**voltage**dropped across the**resistor**(as given by Ohm's law).#### What is the role of a capacitor in a circuit?

**Capacitors**store electric energy when they are connected to a battery or some other charging**circuit**. They are commonly placed in electronic components and are used to maintain a power supply while the device is unplugged and without a battery for a short time.#### What is a capacitor in a circuit?

A**capacitor**is a passive two-terminal electrical component that stores potential energy in an electric field. The effect of a**capacitor**is known as capacitance.**Capacitors**are widely used as parts of electrical**circuits**in many common electrical devices. Unlike a resistor, an ideal**capacitor does**not dissipate energy.

C.

### Do resistors lower voltage?

In short:

**Resistors**limit the flow of electrons, reducing current.**Voltage**comes about by the potential energy difference across the**resistor**. The mathematical answer is that a**resistor**is a two-terminal electric device which obeys, or you could say enforces, Ohm's law: V=IR.#### Can you use a resistor to reduce voltage?

The**voltage**dropped by a**resistor**is given by Ohm's Law: V = I R. So if you know exactly how much current your device**will**draw, you**could**choose a**resistor to drop**exactly 7.5 V, and leave 4.5 V for your device, when that current is run through it.#### Can you convert a 220 to a 110?

Converting**220**volts to**110**volts is possible.**You can convert 220**volts to**110**volts by either using an adapter plug or removing the existing**220**receptacle from the outlet box.#### What happens to current If you add resistors?

In a series circuit,**adding**more**resistors**increases total resistance and thus lowers**current**. But the opposite is true in a parallel circuit because**adding**more**resistors**in parallel creates more choices and lowers total resistance. If the same battery is connected to the**resistors**,**current**will increase.

Updated: 29th September 2018