Electrical Engineering - Energy and Power - Discussion
Discussion Forum : Energy and Power - General Questions (Q.No. 1)
1.
A 33 
half-watt resistor and a 330 half-watt resistor are connected across a 12 V source. Which one(s) will overheat?
half-watt resistor and a 330 half-watt resistor are connected across a 12 V source. Which one(s) will overheat?33
330
both resistors
neither resistor
Discussion:
58 comments Page 2 of 6.
Jogi said:
1 decade ago
Actually depends on understanding that how both the resisters are connected. It is not clear how they are connected ie series or parell. It depends upon indually and its answer is different in both condition.
Himanshu said:
1 decade ago
Option d is correct as both are taking same power and are connected in parallel (as given in question they are conected across 12 we supply. Across means parallel).
Arti said:
1 decade ago
Heat generated = (square of current)* Resistance * time
This means higher the current, more is the heat generated.
For 33ohms resistance across 12 V source, current is 0.36A.Hence heat generated per second will equal to 4.28 joules.
For 330 ohms resistance across 12V source, current is 0.036A. So heat generated per second= 0.436 joules.
Hence Option A is correct.
This means higher the current, more is the heat generated.
For 33ohms resistance across 12 V source, current is 0.36A.Hence heat generated per second will equal to 4.28 joules.
For 330 ohms resistance across 12V source, current is 0.036A. So heat generated per second= 0.436 joules.
Hence Option A is correct.
Biswajit said:
1 decade ago
What is half-watt resistor ?
Latha said:
1 decade ago
@Arti then how do you consider the wattage of resistance?
Shekhar said:
1 decade ago
When the resistance of the conductor is more then current drop will be more then heat will generat more as compare to low resistance of the conductor.
Suresh Maniar said:
1 decade ago
Both Resistances are Connected across same voltage of 12V.
Wattage=V square/R since V=Const or same for both smaller are value shall draw more power and heat up more.
Wattage=V square/R since V=Const or same for both smaller are value shall draw more power and heat up more.
Dayo said:
1 decade ago
Both resistors are connected in series, therefore same voltage flow across each of them & there s also balance in heat dissipated by each.
Akhilesh pandit said:
1 decade ago
Power consumed by each of them is same so both of them get equally heated.
Sagar singh said:
1 decade ago
Since they are connected in parallel and 33 ohm is very less than 330 ohm more current will flow through 33 ohm, and therefore more heat will dissipate across 33 ohm and it gets over heated.
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