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The whole point of earthing or grounding is to provide a low-impedance path back to the supply transformer in the event of an earth fault within a wiring installation, which will then enable sufficient earth-fault current to flow in order to operate the circuit's protective device (circuit breaker or fuse). When designing the circuit's protection system, it is therefore necessary to determine the resistance of the earth (ground) as it determines the value of this current.
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To measure DC of big bus bar?
A: TO measure the current on any path you will need a very small known resistance in sires and measure the voltage drop across it. If the resistance i not small then inaccuracy of reading will be evident
How will you get 6.75 ohm resistance in combination of resistors bacause i have no any value resistor is available?
6.8 ohms is a standard value, and 6.8 is within 0.74% of 6.75. If you need a precise value, use a potentiometer or start playing with resistors, because resistors have tolerance and you will not be able to build an exact 6.75 by just looking at values - you need to measure combinations.
Can you measure the internal resistance of dry cell using multimeter?
Well, you do use a multimeter to measure it, but not directly. You need at least one other thing besides the multimeter and the dry cell. Here's a simple way to do it: -- Take a resistor. With the meter set to measure resistance, measure the resistor's value. Call that 'R'. -- With the meter set to measure voltage, measure the voltage of the dry cell. Call it 'V1'. -- Connect the resistor across the dry cell. Measure the dry cell's voltage again. Call it 'V2 ' this time . V2 will be less than V1 . The internal resistance of the dry cell is R times (V1 - V2) / V2
What is a resister in electronics?
The resistor a passive component is oppose the flow of electric current. How much it oppose to current it depend on the value of resistance and the value of resistance is mention on it on the color code format. you need to remember the value of every color.
Whet does 4-8 ohms mean?
this is range of 4 ohms resistance in an electrical device. Ohms is a measure of resistance in electrical qualities. Circuits and devices are rated , or measured for there resistance in ohms to meet a designed electrical need. Is this related to a speaker?
How can you get a height on a person that is not able to stand?
You need to get a flexible measuring ruler... Lay them on the ground... And measure them that way.
What instrument used to measure alternating current?
A multimeter has the ability to measure both AC and DC current along with voltage and resistance.
What three types of support control measure do you need until the recovery of the imdc personnel?
Air, Fire, and Ground.
Why can't the resistance cannot be measured with ammeters and voltmeters?
It can be calculated by a multimeter. [aka. avometer (ampere voltage ohm meter)]. A single voltmeter or ammeter could not measure resistance because this process need calculations. That means the device must be able to measure the voltage and current at the same time.
What is the value of relative error if the absolute error is -10?
You need to know the measure in order to answer the question.
Name the instrument used to measure electric current?
A magnetic compass can detect current, butyou'll need an Ammeter to measure it.A galvanometer can detect current ~ butyou'll need an Ammeter to measure it.
Why does your grounding meter read OL from gen to 1st ground rod and from 1st to 2nd ground rod get 28.51 ohms?
Code requires that the resistance between the two grounding electrodes be 25 ohms or less. You don't mention how deep they are or how far apart they are. THat will make a difference. Or it could be the soil they are in.You need to get the resistance down
