Physics possible quiz

The total current going through two resistors in series is equal to the sum of the current going through each individual resistor: Ι = Ι 1 + Ι 2.

(No, this is for parallel cases. In the series case, the current is the same everywhere.) The correct answer is 'False'.

The total voltage drop across two resistors in parallel is equal to the sum of the voltages across the two individual resistances ΔV = ΔV1 + ΔV2

(Resistors in parallel have more than one paths. All paths share the same ends. The total voltage difference is equal to the voltage difference of EACH path. ΔV = ΔV1 = ΔV2. The current doesn't go through those paths in steps.) The correct answer is 'False'.

The total current going through two resistors in parallel is equal to the sum of the current going through each individual resistor: Ι = Ι 1 + Ι 2.

(Yes. The currents in parallel paths add together at the joint when they meet.)

The total current going through two resistors in parallel is equal to the sum of the current going through each individual resistor: Ι = Ι 1 + Ι 2.

(Yes. The currents in parallel paths add together at the joint when they meet.) The correct answer is 'True'.

What is a resistor?

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, Resistors=reduce current flow(They are the guage of flow on a water pipe) he behaviour of an ideal resistor is dictated by the relationship specified by Ohm's law: = Current/Resistence

When two or more resistors are connected in parallel, the current going through each one of them must be equal.

FALSE (Parallel resistors are on different paths. Parallel paths share the same ends, hence the parallel resistors share the same potential difference DeltaV between the same two ends, and however, the path with the smaller R will get the higher current.)

When two or more resistors are connected one after another, they are in series. The voltage difference (potential difference) across each resistor has to be equal. t/f

FALSE *(DeltaV=IR. Resistors in series have the same I, but may have different R, hence the larger the R, the more the DeltaV)*

How to find the Current from Current Density?

Integral of J da

What Letter Stands for current density?

J

What is the equation of current Density?

J= Current/Unit Area= I/A

When two or more resistors are connected one after another, they are in series. The current going through each one of them is equal. T/F Why?

True FROM QUIZLET: this answers it, current is amount of water, the amount of water does not change, the resistor may speed up or slow down the flow of water to the next resistor, about ultimately the total amount is the same? Current in a circuit is like water in pipes. Think of a tap as a resistor: the more you close it, the slower the water runs out, and the slower the water moves in from the pipes in the wall. The same volume of water is still moving through the tap. Now imagine you have two taps, say a main water-line tap, and a bathroom tap. Assuming all other taps in the house are closed, imagine the main water-line tap only allowing a little water through, then no matter how much you open the bathroom tap, the small amount of water allowed to run through the main tap will be the maximum allowed to run through the bathroom tap. But your question is a good one, because it asks why this happens. I believe the simple answer to that is that current is carried by moving electrons. The electrons don't leave the voltage source, travel through the circuit and return to the voltage source to complete the flow of that charge, rather the electrons move like this: imagine a row of small, solid balls in a trough. If you push the one on the one end, all the balls move together. If you add resistance at any point where the balls move, all of them will move slower together.

The equivalent resistance for two resistors in series is equal to the sum of the two individual resistances. Req= R1 +R2

True it is a simple equation for a simple proccess Linear for linear proccess

When two or more resistors are connected in parallel, the voltage difference (potential difference) across each resistor is the same. I don't fully get this, come back to this please.

True (Parallel resistors are on different paths. Parallel paths share the same ends, hence the parallel resistors share the same potential difference DeltaV between the same two ends)

What is the difference between Electrical potential and current?

Voltage or Potential is a measure of the electric potential energy between two points. Current is a measure of the flow of charge between two points separated by a potential difference. A classic analogy is to compare electricity to water flowing out of a tank filled with water, into another tank at a lower height. Each molecule of water is analogous to a charge particle. The potential difference is the difference in water pressure between your input and output (or the height of the water column). And the current analog is the flow of water out of the tank. This also makes it easier to visualize other analogs like resistance and series and parallel connections.

The ampere is a unit of

electric current Amper= C/s Ohm's law states that the voltage (V) across a resistor is proportional to the current (I), where the constant of proportionality is the resistance (R). For example, if a 300 ohm resistor is attached across the terminals of a 12 volt battery, then a current of 12 / 300 = 0.04 amperes flows through that resistor. !2(volts)/300Ohms= 0.04Amperes