- What four things does the resistance of a wire depend on?
- What is the value of the resistance of a short circuit?
- Is resistance good or bad for a circuit?
- Why is resistance necessary in a circuit?
- What increases resistance in a wire?
- What can cause high resistance in a circuit?
- Does a short circuit have 0 resistance?
- What happens if resistance is too high?
- How much is too much resistance in a wire?
- How do you reduce resistance in a circuit?
- What happens if there is no resistance in a circuit?
- What are 4 factors affecting resistance in a wire?
- What is the difference between current voltage and resistance?
- How are resistance and current related?
- Can you have negative resistance?
- Can you have zero resistance in a circuit?
- Do all wires have resistance?
- What is a high resistance fault?
- How do I calculate resistance?
- What is an example of a resistance?
What four things does the resistance of a wire depend on?
The resistance of a given piece of wire depends of three factors: the length of the wire, the cross-sectional area of the wire, and the resistivity of the material composing the wire.
To understand how this works, think of water flowing through a hose..
What is the value of the resistance of a short circuit?
In circuit analysis, a short circuit is defined as a connection between two nodes that forces them to be at the same voltage. In an ‘ideal’ short circuit, this means there is no resistance and thus no voltage drop across the connection. In real circuits, the result is a connection with almost no resistance.
Is resistance good or bad for a circuit?
Resistance can be both good and bad. If we are trying to transmit electricity 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.
Why is resistance necessary in a circuit?
In an electronic circuit, the basic function of a resistor is to limit the current to a safe value so that the associated sophisticated parts can function properly. Here R is the constant of proportionality and is known as the resistance of the resistor.
What increases resistance in a wire?
There is a resistance to the flow of an electric current through most conductors . The resistance in a wire increases as: the length of the wire increases. the thickness of the wire decreases.
What can cause high resistance in 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. All conductors give off some degree of heat, so overheating is an issue often associated with resistance.
Does a short circuit have 0 resistance?
A short circuit implies that the two terminals are externally connected with resistance R=0 , the same as an ideal wire. … This means there is zero voltage difference for any current value. (Note that real wires have non-zero resistance!)
What happens if resistance is too high?
If resistance is too high, current will be low if voltage is okay. NOTE: When the voltage stays the same, such as in an Automotive Circuit… current goes up as resistance goes down, and current goes down as resistance goes up. Bypassed devices reduce resistance, causing high current.
How much is too much resistance in a wire?
Ideally, the resistance should be 2000 Ω, but due to the existence of a wire, the measured resistance is 2000.01693 Ω, it’s less than 10 parts per million higher, nearly undetectable.
How do you reduce resistance in a circuit?
There are several factors that affect the resistance of a conductor;material, eg copper, has lower resistance than steel.length – longer wires have greater resistance.thickness – smaller diameter wires have greater resistance.temperature – heating a wire increases its resistance.
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). … Current will flow, and since the resistance is low — though not zero — you will just get a really large current.
What are 4 factors affecting resistance in a wire?
There are 4 different factors which 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.
What is the difference between current voltage and resistance?
Voltage is the difference in charge between two points. Current is the rate at which charge is flowing. Resistance is a material’s tendency to resist the flow of charge (current).
How are resistance and current related?
The relationship between current, voltage and resistance is expressed by Ohm’s Law. This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit, provided the temperature remains constant.
Can you have negative resistance?
Unlike most positive resistances, negative resistance varies depending on the voltage or current applied to the device, and negative resistance devices can only have negative resistance over a limited portion of their voltage or current range.
Can you have zero resistance in a circuit?
Points directly connected together in a circuit by zero resistance (wire) are considered to be electrically common. Electrically common points, with zero resistance between them, will have zero voltage dropped between them, regardless of the magnitude of current (ideally).
Do all wires have resistance?
So you can see that resistance is inherent in every type of wire. There are cases when some materials can be cooled down to very temperatures where they have effectively zero resistance, but in everyday encounters electricity this, effect doesn’t really have much bearing.
What is a high resistance fault?
A high-resistance connection (HRC) is a hazard that results from loose or poor connections in traditional electrical accessories and switchgear which can cause heat to develop, capable of starting a fire. … Electrical equipment should be regularly maintained by competent people.
How do I calculate resistance?
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 a resistance?
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.