Resistance
causes some of the electrical energy to turn into heat so some electrical energy
is lost along the way. However, it is resistance that allows us to use electricity for heat and light. The heat that is generated from electric heaters or the light that we get from light bulbs is due to resistance.
Why do we use resistance in a circuit?
Resistance in any electric wire
helps in manipulating the current that is flowing through the circuit
. … Furthermore it sometimes helps in saving electric appliances from excess current as the excess current would produce greater heat in the presence of resistance leading to breakdown of circuit at that point.
What is the resistance and why is it important?
Resistance is an important factor in electronic circuits,
higher resistance makes the current flow more difficult
, lower resistance makes the current flow less difficult.
Why are resistors needed?
Resistors
ensure components receive the proper voltage by creating a voltage drop
, and they can protect a component from voltage spikes. … If a component in your circuit requires less voltage than the rest of your circuit, a resistor will create a voltage drop to ensure the component does not receive too much voltage.
Is the resistance Good or bad?
Resistance can be both good and bad
. If we are trying to transmit electricity efficiently from one place to another through a conductor, resistance is undesirable in the conductor. Resistance causes some of the electrical energy to turn into heat so some electrical energy is lost along the way.
What happens if resistance is too high?
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
. All conductors give off some degree of heat, so overheating is an issue often associated with resistance.
What is a good resistance reading?
It automatically subtracts test lead resistance—typically 0.2 Ω to 0.5 Ω. Ideally, if test leads touch (are shorted together), the display should show
0 Ω
. … Read the measurement on the display.
What are the factors affecting the resistance?
Resistance is the property of the material that restricts the flow of electrons. There are four factors affecting resistance which are
Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material
.
What is considered high resistance?
High electrical resistance is
the opposition to current flow within a circuit
. … A high electrical resistance of an electrical conductor is the opposition to the flow of an electric current through that conductor; the inverse measure is known as electrical conductance. The SI unit of electrical resistance is the ohm (O).
Why do you need a resistor for LED?
An LED (Light Emitting Diode) emits light when an electric current passes through it. … The ballast
resistor is used to limit the current through the LED and to prevent excess current that can burn out the LED
. If the voltage source is equal to the voltage drop of the LED, no resistor is required.
Do resistors affect voltage?
The
larger the resistor
, the more energy used by that resistor, and the bigger the voltage drop across that resistor. Ohm’s Law can be used to verify voltage drop. In a DC circuit, voltage equals current multiplied by resistance.
What are the 4 types of resistors?
- Carbon Composition Resistor.
- Thermistor.
- Wire Wound Resistor.
- Metal Film Resistor.
- Carbon Film Resistor.
- Variable Resistor.
- Varistor
- Light Dependent Resistor.
What are the 4 factors that affect resistance?
- The type of material of which the resistor is made.
- The length of the resistor.
- The thickness of the resistor.
- The temperature of the conductor.
Who is the leader of the resistance?
The ultimate authority of the Resistance lay in its General,
Leia Organa
, who had once been a vital leader in the Alliance to Restore the Republic during the Galactic Civil War, and reputedly knew the name of every single member in her organization.
What happens if there is no resistance in a circuit?
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 causes high resistance?
Spiral Heating caused by broken or snipped conductors
(above). Resistance, opposition to current flow in a circuit. Connection anomalies pose resistance problems in our motor circuits and if they are not identified and corrected, they can have deleterious effects.
