- What are the 4 factors that affect resistance?
- What is an example of high resistance?
- What is a bad resistance reading?
- How many ohms is an open circuit?
- Is resistance directly proportional to power?
- Does higher resistance mean more heat?
- What causes resistance?
- Does higher resistance mean more power?
- What is the resistance of the heater?
- Is high resistance Good or bad?
- What does a high resistance reading mean?
- Why does high current cause heat?
- Do heating elements have high resistance?
- What happens to power when resistance is doubled?
- How do you get high resistance?
- What is a the highest resistance?
- How do you fix a high resistance fault?
- How many ohms is a good ground?
- Is voltage directly proportional to resistance?
- Why is resistance directly proportional to length?
- Does higher ohms mean more resistance?
What are the 4 factors that affect resistance?
Factors That Affect Resistance How much resistance a material has depends on several factors: the type of material, its width, its length, and its temperature.
All materials have some resistance, but certain materials resist the flow of electric current more or less than other materials do..
What is an example of high resistance?
Examples: silver, copper, gold and aluminum. Insulators: Materials that present high resistance and restrict the flow of electrons. Examples: Rubber, paper, glass, wood and plastic.
What is a bad resistance reading?
While you may not know exactly what the resistance of your particular motor should be, you do know that it should be more than zero! A resistance measurement of less than .5 ohms usually indicates a short circuit in the motor winding.
How many ohms is an open circuit?
Open-When the term open is used in relation to an electrical circuit it means current cannot flow or no continuity. Infinity ohms-This is what an ohmmeter reads when placed on an open circuit. On an analog meter infinity ohms is when the needle doesn’t move at all and on a digital meter infinity ohms is 1 .
Is resistance directly proportional to power?
Power in electronics is the rate of doing work. Resistance is the opposition offered against the flow of electrons. The relation between power and resistance is proportional.
Does higher resistance mean more heat?
A higher resistance produces more heat. The time, t for which current flows. The longer the time the larger the amount of heat produced. The amount of current, I. the higher the current the larger the amount of heat generated.
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.
Does higher resistance mean more power?
Current sources are the other way around. They’re designed for high internal resistance so you get a hotter load for a higher load resistance. But in general, you get more power in the load if it’s matched to the source. It depends on if your power supply is constant voltage or constant current.
What is the resistance of the heater?
Heaters are nearly purely resistive so 1500watts/120V = 12.5A, 120V/12.5A = 9.6 ohms. That would be the steady state resistance of a 120V 1500watt heater. Need more details to give a specific answer. In the USA, most house circuits are a max of 15V at 120V so most heaters will be limited to 1500watts.
Is high resistance Good or bad?
Resistor Symbols Low resistance, for example 1Ω or less implies that the circuit is a good conductor made from materials such as copper, aluminium or carbon while a high resistance, 1MΩ or more implies the circuit is a bad conductor made from insulating materials such as glass, porcelain or plastic.
What does a high resistance reading mean?
Read the resistance value. Higher numbers indicate a higher resistance rating, which means more energy will be required to integrate the component in a circuit. When you test a resistor, capacitor, or another electronic component, the ohmmeter will display a number indicating its resistance.
Why does high current cause heat?
The electrons have a mass (however small), and when they move through the conductor, there are collisions that produce heat. The more electrons bumping into the atoms of the conductor, the more heat is created, so higher current generally means greater heat.
Do heating elements have high resistance?
A heating element has neither “very high” nor “very low” resistance. The total energy dissipated by the circuit is proportional to current, so the resistance of the heating element has to be low enough to draw sufficient current to generate enough heat.
What happens to power when resistance is doubled?
So doubling or tripling the voltage will cause the current to be doubled or tripled. On the other hand, any alteration in the resistance will result in the opposite or inverse alteration of the current. So doubling or tripling the resistance will cause the current to be one-half or one-third the original value.
How do you get high resistance?
To get higher resistance you can:Make your wire longer – more wraps or bigger inner diameter of coil.Use a thinner wire – higher wire gauge.
What is a the highest resistance?
Answer Expert Verified (a) The highest resistance is when the resistances are connected in series. Total resistance in series = R₁ + R₂ + R₃ + R₄ Total resistance in series = 4 + 8 + 12 + 24. Total resistance in series = 48 Ω
How do you fix a high resistance fault?
Faults arising from disconnected or broken wires can usually be fixed simply by re-terminating the wire correctly at the accessory position. If however the fault was a high resistance connection care must be taken to ensure that damage has not occurred due to the localised heating effect.
How many ohms is a good ground?
5.0 ohmsIdeally a ground should be of zero ohms resistance. There is not one standard ground resistance threshold that is recognized by all agencies. However, the NFPA and IEEE have recommended a ground resistance value of 5.0 ohms or less.
Is voltage directly proportional to resistance?
In other words, the current is directly proportional to the voltage and inversely proportional to the resistance. So, an increase in the voltage will increase the current as long as the resistance is held constant. … If the current is held constant, an increase in voltage will result in an increase in resistance.
Why is resistance directly proportional to length?
As the length increases, the number of collisions by the moving free electrons with the fixed positive ions increases as more number of fixed positive ions are present in an increased length of the conductor. As a result, resistance increases.
Does higher ohms mean more resistance?
Ohms are units of resistance. The lower the resistance of your atomizer, the larger the amount of current flowing through it. If you increase resistance, the atomizer receives less current. … Also, the relationship between voltage (Volts) and resistance (Ohms) is important.