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vadevalor
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Why is the potential at X , denoted by V, not
V/8 = 4.8/(4.8+7.6) ? Why is numerator of resistance part 7.6 and not 4.8 by potential divider principle?
vadevalor said:Answer is A but i don't understand the solution as there are 'conflicting battery direction' and i don't know how to start
tiny-tim said:hi vadevalor! start by replacing the three batteries by one 3V battery …
what is the potential at Y? and where is that measured from?
and now adjust that to start from X instead
vadevalor said:Should i put the 3v battery to the right or left of X and should i go from + terminal to -terminal from X to Y like current flow or electron flow?
Smiles :D
tiny-tim said:hi vadevalor! you must always always ALWAYS use current flow not electron flow!
X is somewhere in the middle of the 3V battery, isn't it?
vadevalor said:Above for potential divider i was told to look at electron flow
tiny-tim said:hi vadevalor!
conventionally, the current flows from the positive terminal (long line) to the negative terminal (short line)
(the electrons, of course go the other way, towards the positive!)
so the short line is at zero potential, and you have to start from the short line to get to X to find the potential at X, ie the potential difference from zero
(see eg "Electric Potential Diagrams" at http://www.physicsclassroom.com/class/circuits/u9l1c.cfm)
ie you go through the 7.6Ω, so 7.6 is in the numerator
vadevalor said:Its the third paragraph from your first answer :) starting from the short line (electron flow direction)
The potential at a point in a circuit refers to the electric potential energy per unit charge at that specific point. It is measured in volts (V) and is a measure of the amount of work needed to move a unit charge from one point to another within the circuit.
The potential at a point in a circuit is calculated by dividing the electric potential energy at that point by the amount of charge present. This can be represented by the equation V = U/Q, where V is the potential, U is the potential energy, and Q is the charge.
The potential at a point in a circuit is affected by the amount of charge present, the distance between the point and the source of the potential, and any components in the circuit that may influence the flow of charge.
The potential at a point in a circuit is important because it determines the direction and magnitude of the electric field at that point. It also allows us to calculate the amount of work needed to move a charge within the circuit and can help us understand the behavior of components in the circuit.
The potential at a point in a circuit is essentially the same as the voltage at that point. Voltage is a measure of the potential difference between two points in the circuit, and the potential at a specific point is just the voltage at that point compared to a reference point. In other words, potential is a specific type of voltage measurement.