What is a resistance in science simple definition?

resistance. [ rĭ-zĭs′təns ] A force, such as friction, that operates opposite the direction of motion of a body and tends to prevent or slow down the body’s motion. A measure of the degree to which a substance impedes the flow of electric current induced by a voltage. Resistance is measured in ohms.

What is an example of resistance in science?

For example, a wire’s resistance is higher if it is long and thin, and lower if it is short and thick. All objects resist electrical current, except for superconductors, which have a resistance of zero.

What is resistance and example?

Resistance is defined as a refusal to give in or to something that slows down or prevents something. An example of resistance is a child fighting against her kidnapper. An example of resistance is wind against the wings of a plane.

What causes resistance?

An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance.

What is a resistance in science simple definition? – Related Questions

How do we determine the resistance give example?

If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm’s Law: R = V / I. For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance RT = 9 volts / 3 amps = 3 Ω.

What is an example of resistance in psychology?

Examples of psychological resistance may include perfectionism, criticizing, disrespectful attitude, being self-critical, preoccupation with appearance, social withdrawal, need to be seen as independent and invulnerable, or an inability to accept compliments or constructive criticism.

What are some real life applications of resistors?

Let’s discuss some examples of resistors in real life.
  • Street Lighting.
  • Laptop and Mobile Chargers.
  • Temperature Control.
  • Fan Speed Controller.
  • Measuring Electrical Current.
  • Temperature Sensor.
  • In-Circuit Functioning.
  • Dividing Voltage.

What is the use of resistance in a circuit?

Resistance serves as an indicator that quantifies how readily current will flow in a circuit using ohms (Ω) as the unit. Current increases when resistance decreases, and it decreases when resistance increases. Resistors are essential in order to ensure that current flows at the appropriate level in circuits.

What is resistance and why is it important?

Resistance is another important property that can be measured in electrical systems. Resistance is measured in units called ohms. Resistance is a term that describes the forces that oppose the flow of electrical current in a conductor. All materials naturally contain some resistance to the flow of electron current.

How do you measure resistance?

Resistance can be calculated by measuring the current and voltage using Ohm’s Law. As a result, a circuit’s resistance value can be determined if the current and voltage measured values are known. Analog multimeters and digital multimeters employ the measurement principle of Ohm’s Law to measure resistance.

What will happen if no resistance?

If there really were no resistance in the circuit, the electrons would go around the circuit, and arrive back at the beginning of the circuit with as much energy as the potential difference (the voltage). That final energy is usually what is dissipated as heat or other types of energy by the circuit.

What does high resistance mean?

Resistance measurements are normally taken to indicate the condition of a component or a circuit. The higher the resistance, the lower the current flow. If abnormally high, one possible cause (among many) could be damaged conductors due to burning or corrosion.

Is high resistance Good or bad?

The amount of resistance a resistor has is determined by the relationship of the current through it to the voltage across it which determines whether the circuit element is a “good conductor” – low resistance, or a “bad conductor” – high resistance.

Can you have negative resistance?

Negative resistance occurs when the “Volts per Amp” (V/I) has a negative sign, which implies that the circuit element(s) in question source power. Stated another way, a negative resistance will have a current that is 180˚ from a positive resistance.

Which semiconductor is used in Gunn diode?

Gunn Diode’s Working

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This diode is made of a single piece of N-type semiconductor such as Gallium Arsenide and InP (Indium Phosphide).

What is tunnel diode oscillator?

The tunnel diode oscillator (TDO) is a highly stable self resonating oscillator system that we use to measure rf penetration depth in conducting, superconducting, and magnetic materials.

What is the tunnel diode?

A tunnel diode or Esaki diode is a type of semiconductor diode that has effectively “negative resistance” due to the quantum mechanical effect called tunneling. It was invented in August 1957 by Leo Esaki, Yuriko Kurose, and Takashi Suzuki when they were working at Tokyo Tsushin Kogyo, now known as Sony.

What is pin junction diode?

A PN-junction diode is formed when a p-type semiconductor is fused to an n-type semiconductor creating a potential barrier voltage across the diode junction. Advertisement. The PN junction diode consists of a p-region and n-region separated by a depletion region where charge is stored.

How many types of diodes are there?

A diode is a two terminal electrical device. Diodes are made from a semiconductor, most often silicon but sometimes germanium. There are various types of diodes, but the ones being discussed here are Zener, Rectifier, Schottky, Transient Voltage Suppressor, Thyristor, Silicon Controlled Rectifier, and TRIAC.

What is knee voltage?

Knee voltage is the forward voltage at which the flow of the current through the PN junction of the diode increases rapidly. The knee voltage is generally observed in Zener Diodes.

What is forward bias?

What is Forward Bias? Forward bias or biasing is where the external voltage is delivered across the P-N junction diode. In a forward bias setup, the P-side of the diode is attached to the positive terminal and N-side is fixed to the negative side of the battery.

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