Electrical Engineering - Energy and Power - Discussion

Discussion Forum : Energy and Power - General Questions (Q.No. 21)
The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be
2 W
1 W
5 W
0.5 W
Answer: Option
No answer description is available. Let's discuss.
12 comments Page 1 of 2.

Asru said:   2 years ago
The exact answer is 1W.

D Shwetha said:   6 years ago
1.2W resistor rating b/w above 1W below 1.5W/2W.

1W resistor is will use instead of 1.2W resistor will heatup. So we can use a 2W resistor instead of 1.2W. Rating will high no problem for ckt but rating will less than operating value equipment will burn.

Stuti kushwaha said:   8 years ago
If equipment handles the 1.2 w then it's rated value should be greater than 1.2 w and nearest also other wise more losses will occur.

Abdul rauf khan said:   9 years ago
It is an assumption that the source is reliable if it can supply 70% of its own power rating & 30% of power is required to energies itself.

ABDUL RAUF KHAN said:   9 years ago

Basically in case of the selection of the switchgear:

1) First in case of the selection of switch the rating at least 2.5 times of the rated current in case of continuous duty cycle.

2) Secondly the selection of switchgear like MCB, MCCB, ELCB, RCCB depends on the type of load selection i.e. in case of induction motor the starting current is high in that case the rating of switchgear is some higher than the starting current otherwise the mcb trip the circuit.

3) In case other than the induction load the rating is 2.5 times of the load current.

Jay said:   10 years ago
Only 2watt resistor is handle 1.2 watt because it was a nearest resistor for handle it.

Deepak said:   10 years ago
So what is answer and why?

Manoj said:   1 decade ago
To handle 1.2 W, it should be of a slightly higher rating. If we choose a very high rating, cost increases. So it is advisable to choose a slightly higher rating of resistors.

Bama said:   1 decade ago
Carbon resistors, for example, are commonly made in wattage ratings of 1/8 (0.125) W, 1/4 (0.250) W, 1/2 (0.5) W, 1W, and 2 Watts. Generally speaking the larger their physical size the higher its wattage rating. However, it is always better to select a particular size resistor that is capable of dissipating two or more times the calculated power.

Gjs said:   1 decade ago
What is carbon composition resistor?

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