Electrical Engineering - Parallel Circuits - Discussion
Discussion Forum : Parallel Circuits - General Questions (Q.No. 17)
17.
A sudden increase in the total current into a parallel circuit may indicate
Discussion:
18 comments Page 1 of 2.
Aleksandr said:
10 years ago
@Belal is wrong.
1. Power is not same consumption power P = I*V. So I = V/R. If V decrease, I decrease, P decrease. I increase when V increase. So if we put 1000V current will so big that resistor just burn because current goes up.
2. Belal right when say If there is open of one branch the total parallel resistance will increase and V = I*R, therefore I = V/R. So resistance increase current decrease.
Answer C, please explain me why D?
1. Power is not same consumption power P = I*V. So I = V/R. If V decrease, I decrease, P decrease. I increase when V increase. So if we put 1000V current will so big that resistor just burn because current goes up.
2. Belal right when say If there is open of one branch the total parallel resistance will increase and V = I*R, therefore I = V/R. So resistance increase current decrease.
Answer C, please explain me why D?
Jagadesh said:
10 years ago
If in a parallel circuit occurs a sudden increase in total current i.e, due to increase in voltage only because i = v/r.
The correct option is "C".
If V increases I also increases.
From option D, if V and are increase then sudden increase in will not occur.
From option A, if V decreases I also decreases.
From option B, if resistor is open circuited then the total resistance decreases. So the current also decreases.
The correct option is "C".
If V increases I also increases.
From option D, if V and are increase then sudden increase in will not occur.
From option A, if V decreases I also decreases.
From option B, if resistor is open circuited then the total resistance decreases. So the current also decreases.
Anomie said:
6 years ago
Answer is C.
In case if there is an open resistor, then the current flowing through that resistor will split and flow through the other resistances. So even in that case, only the current flowing through each resistor will increase. But the total current into the parallel circuit will remain same.
Thus as per Ohms law V=I*R, the total current into the circuit will increase if the source voltage increases.
In case if there is an open resistor, then the current flowing through that resistor will split and flow through the other resistances. So even in that case, only the current flowing through each resistor will increase. But the total current into the parallel circuit will remain same.
Thus as per Ohms law V=I*R, the total current into the circuit will increase if the source voltage increases.
VAGEESH said:
1 decade ago
Here open circuit indicates infinite resistance. So in parallel circuits total resistance is 1/R i.e 1/ (infinity) i.e ZERO.
Thus current I=V/R i.e V/0 i.e infinite current flows when there is a open circuit in case of parallel connection. But current also increases as source voltage increases since I is proportional to V.
Thus current I=V/R i.e V/0 i.e infinite current flows when there is a open circuit in case of parallel connection. But current also increases as source voltage increases since I is proportional to V.
Jay tiwari said:
1 decade ago
Yes answer is c, not d because we calculate with assume value like:
V = 10.
I1 = 5 amp.
I2 = 2 amp.
I3 = 1 amp.
Then resister value is fallowing:
R1 = 2 ohm.
R2 = 5 ohm.
R3 = 10 ohm.
If resistance are constant we do not increase current without increasing in voltage.
You can check it with put the value an calculation.
V = 10.
I1 = 5 amp.
I2 = 2 amp.
I3 = 1 amp.
Then resister value is fallowing:
R1 = 2 ohm.
R2 = 5 ohm.
R3 = 10 ohm.
If resistance are constant we do not increase current without increasing in voltage.
You can check it with put the value an calculation.
Chintan said:
1 decade ago
As mentioned that this is PARALLEL CIRCUIT, Current can increase only in two conditions:
1) Either resistance decreases (In this case total resistance can be decreased only if another resistor is added in parallel).
Or
2) Voltage, applied to the circuit, increases.
So answer should be [C].
I agree with Saurabh.
1) Either resistance decreases (In this case total resistance can be decreased only if another resistor is added in parallel).
Or
2) Voltage, applied to the circuit, increases.
So answer should be [C].
I agree with Saurabh.
Ali Assad Mir said:
3 years ago
Agree @Saurabh.
As mentioned that this is PARALLEL CIRCUIT, Current can increase only in two conditions:
1) Either resistance decreases (In this case total resistance can be decreased only if another resistor is added in parallel).
Or
2) Voltage, applied to the circuit, increases.
So, the answer should be [C].
As mentioned that this is PARALLEL CIRCUIT, Current can increase only in two conditions:
1) Either resistance decreases (In this case total resistance can be decreased only if another resistor is added in parallel).
Or
2) Voltage, applied to the circuit, increases.
So, the answer should be [C].
Shraddha said:
1 decade ago
Given that it is a parallel circuit Current will suddenly increase when there is open circuit (because open circuit Means infinite resistance, and current always follows low resistance path).
But I don't get the concept of drop in source voltage because voltage in parallel circuit Is constant.
But I don't get the concept of drop in source voltage because voltage in parallel circuit Is constant.
Chetan Krishna said:
1 decade ago
I = V/R;
So I can increase if either source voltage increases or if the effective resistance decreases. But the effective resistance increases if one of the resistors is open.
So 'B' & 'D' are wrong. The voltage has to increase if current has to increase so the correct option is 'C'.
So I can increase if either source voltage increases or if the effective resistance decreases. But the effective resistance increases if one of the resistors is open.
So 'B' & 'D' are wrong. The voltage has to increase if current has to increase so the correct option is 'C'.
Chethan said:
1 decade ago
Answer : C
In parallel circuit if any branch resistor is removed the equivalent resistance increases, current reduces (current is inversely proportional to resistance), as current is directly proportional to applied voltage so if applied voltage increased the circuit current increases.
In parallel circuit if any branch resistor is removed the equivalent resistance increases, current reduces (current is inversely proportional to resistance), as current is directly proportional to applied voltage so if applied voltage increased the circuit current increases.
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