Please check and correct these statements Charge becomes used up as it flows thr
ID: 1270824 • Letter: P
Question
Please check and correct these statements
Charge becomes used up as it flows through a circuit. The amount of charge which exits a light bulb is less than the amount which enters the light bulb
Charge flows through circuits at very high speeds. This explains why the light bulb turns on immediately after the wall switch is flipped.
The local electrical utility company supplies millions and millions of electrons to our homes everyday
Is the a difference between voltage and potential difference
Please refer to picture if you misunderstand what I'm asking for
Explanation / Answer
1
Charge becomes used up as it flows through a circuit. The amount of charge which exits a light bulb is less than the amount which enters the light bulb.
This statement is false .
Charge is neither created nor destroyed, and as such, the amount of charge which enters a light bulb in a second is equal to the amount of charge which exits the light bulb in a second. This quantity (charge per second) is the current and it is everywhere the same in a circuit.
2
Charge flows through circuits at very high speeds. This explains why the light bulb turns on immediately after the wall switch is flipped
This statement is false.
A battery does not supply the charges, copper wire is composed of charges and the battery merely pumps the negative charges around the circuit. This negative electric charge flows very slowly. Total charge is always conserved and cannot be either created or destroyed.
The energy in electric circuits is not carried by individual electrons. Electric energy travels at close to the speed of light moving along the columns of electrons. The energy is carried by the circuit as a whole and not by the individual charged particles. Electric charge flow and electric energy flow are different things. Electric energy travels in wave form-electron compression waves travel inside the wires, the energy is in the invisible fields surrounding the wires.The movement of charge injects energy into the whole circuit all at once.These analogies might help-
When we speak the air leaving our mouths travels very slowly whilst the sound waves generated travel at great speed.
3 The local electrical utility company supplies millions and millions of electrons to our homes everyday
This statement is false.
An electric company has a pumping device or large electrochemical cell which supplies the energy needed to move a charge from a low potential location to a high potential location . It does not supply electrons .Electrons are already present in the wire carrying them which move around a closed circuit.
4
Is the a difference between voltage and potential difference
voltage is either the electromotive force or the potential difference. Electrical potential energy is simply something used to explain cases like.....a positive charge when attracted to a negative charge gains kinetic energy (as it accelerates towards the negative charge), where did that energy come from?
Like different points on the Earth, say, your house and the nearby mountain. Your house (assuming it is at sea level) has a lower gravitational potential than the tip of the nearby mountain (a unit mass has less grav. potential energy in your house than on the mountaintop). A ball can only drop from your mountain to your house because of the difference in height.
More specifically, the ball drops due to the difference in gravitational potential.
Similarly, charges in circuits flow (like the ball dropping) due to potential Difference and not potential itself.
It is like the difference between temperature and temperature difference