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Is it true that the bigger sized cable offers less resistance to current flow?
Wiki User
∙ 6y ago
yes
Wiki User
∙ 6y ago
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What is current capacity of 95 sqmm cable?
what is current capacity of 95 sqmm cable?
What ia Standard of dc loop resistance of copper cable?
It depends on the length of th cable and the diameter of the copper cable used.
Why the cable to an electric cooker is thicker than the cable to a table light?
Since resistance is inversely proportional to the cross-sectional area of a wire, thicker the wire - lesser the resistance and vice-versa. Now, according to Joule's law of heating, H = I^2 R t; i.e. H (Heat) is directly proportional to the square of I (Current), R(Resistance) and t (time). Whereas, according to Ohm's law, V=IR; i.e. V (Potential difference) is directly proportional to I (Current) and R (Resistance) Comparing both the formulas, we can conclude that H (Heat) needs more Current; I. [H=I^2 R t] Therefore, thicker wire. Hence, the cooker needs a thicker wire while a table light needs a comparatively thinner wire.
What is a c200 current transformer?
This is a class of current transformers, and is a fairly low class. This has to do with what kind of burden can be placed on the secondary. A general rule is a C200 current transformer can supply ~200 volts at full ratio to its' secondary. If the burden (the CT resistance + cable resistance + relay or instrument resistance) times the maximum expected current is higher than 200 volts, the CT is likely to saturate. During multiple fault events, a CT may keep some magnetizing current causing CT saturation to be higher on a reclose event. Typically CT's are sized and their ratios are chosen to minimize saturation when feasible.
What is LV cable insulation resistance acceptance value?
The minimum acceptable insulation resistance value is calculated using the following formula: Rinsulation= (Vrated + 1 ) x (304.8 / L ) Where: Rinsulation is the minimum acceptable insulation resistance value, in mega-ohms; Vrated is the rated voltage of the cable (typically printed on the cable), in kilovolts; and L is the length of the cable, in meters (if the cable length is in feet, replace the number 304.8 with 1000).
If voltage and current are proportional why do they increase voltage in powerlines in order to decrease current?
Low current will equal low power losses due to the resistance of the cable. I squared R. (I is transmission current and R is resistance/Metre of cable) by increasing the voltage for the same amount of power the current decreases. Power transmission will take that advantage to transfer less current for the same amount of power.
Can a cracked battery cable cause electrical issues to your car?
Yes, if the cable is cracked and swollen it has a high resistance thus causing a loss of current. Replace any cracked or swollen cable.
What will happens to current when cable length increases?
With a constant voltage and increase in wire length will increase the end to end resistance and therefore the current will decrease.
Why does the earth cable protect us from shocks?
WARNING: VERY simplified answer. An electric current will run through the most easiest path trying to get to the ground. If the easiest path is a person, the current will run through the person and cause varying amounts of harm. If the easiest path is a simple cable running straight into the ground, the current will run through the cable. Humans have a higher resistance than cables, so the easiest path is through the cable. Or perhaps another cable made of a material with even less resistance.
Why Cable gets heated when current flows more than its rated current why?
Because if the rated current is lower than the actual current, it causes resistance to the electrical flow which in turn is dispelled as heat.
What causes low voltage to the transmission selonoid?
Cables aren't perfect conductors, they have a bit of resistance. This resistance cacuse a certain voltage drop. But the drop isn't proportional to the voltage running through the cable, so at lower voltages the proportion lost to internal resistance in the cable will be bigger than at higher voltages.
Define the thermal resistance of a cable?
No. Conductor resistance is. Cable insulation resistance to ground is inversely proportional to its length. The longer the cable, the more leakage path to ground; therefore, the lower the insulation resistance to ground.
How you calculate voltage drops in a cable knowing resistance or impedance and line current in a 3phase system?
Ohm's Law - V = IR.
Why we go for bus bar riser system instead of cables?
It is done to carry more current at rated power & to reduce the power loss as compared to cable since a bus-bar has more area compared to cable so resistance is less & hence losses are reduced. It is done to carry more current at rated power & to reduce the power loss as compared to cable since a bus-bar has more area compared to cable so resistance is less & hence losses are reduced.
If a cable must carry a current of 19.5A with a voltage drop of no more than 6V its resistance must not exceed?
r=v/i=6/19.5=0.3076923077ohm, so,the resistance value must not exceed 0.4 ohm.
What are some current deals for cable companies?
It is best to check with local Cable Companies to see what offers they have, they will vary state to state as well as the ones offered on their national websites and also will change over time
Can insulation resistance of cable be checked with a volt meter?
No. A volt-ohmmeter will not check insulation. To check cable insulation you need a special device (called a megger) made for the purpose that imposes a high voltage and measures current leaks.
