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What is true about the limits on the transmission of electric current in grids?
The transmission of electric current in grids is limited by factors such as the resistance of the conductors, distance traveled, and the capacity of the transformers. These limits are important to prevent overheating of the transmission lines and ensure efficient power delivery. Grid operators carefully manage these limits to maintain a reliable and stable electricity supply.
Does a rheostat control strength of current?
Yes, a rheostat controls the strength of current by adjusting the resistance in a circuit. Increasing the resistance using a rheostat reduces the current flow, while decreasing the resistance increases the current flow.
What do you call a substance that offers resistance?
A substance that offers resistance is called a resistor. It is a component in electronic circuits that limits or controls the flow of electric current.
What is the effect of no emitter resistance on common emitter amplifier?
Limit current through emitter, Often the resistance is the load itself. So the restatnce limits current on what otherwise would act as a voltage follower.
What limits the current that flows through a circuit for a particular appllied DC voltage?
The voltage applied and the resistance across it.
How an object opposes an electrical current passing through it?
An object can oppose an electrical current passing through it by having resistance. This resistance limits the flow of electrons, causing a drop in voltage and generating heat. Materials with high resistance, such as insulators like rubber or glass, will strongly oppose the flow of current.
Which two effects are always present in current flow?
Resistance and temperature rise are two effects that are always present in current flow. Resistance causes a drop in voltage and limits the flow of current, while the flow of current through a conductor generates heat causing a rise in temperature.
How does a rheostat make a current high?
A rheostat is a variable resistor that can increase or decrease the resistance in a circuit. By increasing the resistance in the circuit, the rheostat limits the flow of current, causing it to become higher in the parts of the circuit where the resistance is lower.
What are the base units of the ohm, and how are they defined in the context of electrical resistance?
The base units of the ohm are the volt and the ampere. In the context of electrical resistance, the ohm is defined as the resistance that limits the flow of electric current when one volt is applied across it and one ampere of current flows through it.
How does a resistor work to limit the flow of electric current in a circuit?
A resistor limits the flow of electric current in a circuit by providing resistance to the flow of electrons. This resistance reduces the amount of current that can pass through the circuit, helping to control the flow of electricity and prevent damage to components.
How do resistors affect current flow in an electrical circuit?
Resistors in an electrical circuit reduce the flow of current by impeding the movement of electrons. They create resistance, which limits the amount of current that can pass through the circuit.
Is polythene good conductor?
No, polythene is considered an insulator and not a good conductor of electricity. It has high resistance which limits the flow of electric current through it.
