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Electrical current (amperes, or coulombs per second) is the flow of electrons from one point to another. In a series circuit, there is only one path for those electrons to flow, so the amount of flow at different points in a series circuit is always the same.
That's not to say that the current does not change - certainly different resistance, for instance, would cause different current - the point here is that, for a given set of conditions, the current in a series circuit is the same at every point in the circuit.
This is Kirchoff's current law. The signed sum of the currents entering a node must always be equal to zero. If a node consists only of two elements, then the current entering the node from one element must be equal to the current leaving into the other element. Since a series circuit consists only of nodes with two elements connected together, that means the current at every point in a series circuit is the same.
Think of this analogy. Connect several water hoses in series with modulating valves between each section. Apply water pressure to one end. Make different adjustments to the valves, representing different resistances. Note that, although the water pressure is different at different points (think voltage), the current flow at different points (think current) is the same.
What else can I help you with?
Does adding resistors in series increase or decrease the overall resistance of a circuit?
Resistance in series adds together. two 100 ohm resistors in series are equivalent to one 200 ohm resistor. to make an equation out of it ( even though it is simple) you can say: Rtotal=R1+R2+R3...+Rn
What are the advantages and disadvantages of resistors?
Advantages - very cheap, and easy to replace. Since they fail open circuit, a small low value resistor can be used instead of a more expensive fuse. Disadvantage = waste power, by turning it to heat. If you follow the link below and study the circuit diagram you will see that current is flowing in both Rb1 and Rb2 even when there is no signal being amplified. That "quiescent current" is wasted because it is not achieving anything and power is consumed through the production of heat.
What kinds of circuits need precise resistors?
Timing circuits, and any circuit that depends on the resistor value being fairly precise, such as voltage dividers and comparators. Old story....engineers knew that you couldn't pick through a bunch of loose precision resistors to find close tolerance resistors....The manufacurer already took the close precision resistors and sold them separately. This is not so true these days. Even low tolerance resistors might be high precision. Usually the manufacturer will fill the loose precision needs with parts better than required.
Basic parts and functions of an analog multi tester?
It is a moving-coil galvanometer with a selectable array of shunts and series (bobbin) resistors. Shunts are also resistors but they go in parallel to the meter to restrict current through the meter itself and allow the meter to measure total current flow. The meter is connected in series in the circuit where you want to measure the current and the resistances are low. Series resistors are large and restrict current through the meter as well but the meter is connected in parallel to measure voltage drop. The maths and principles are very simple if you draw them out even if they don't seem so from a description. Resistance measurements are usually a simple current measurement and the meter is calibrated to follow Ohm's law. In old meters (such as the big black AVO meters from 50 years ago and more), for improved accuracy, a special extra "standard" cell was fitted solely for resistance measurements.
Explain thevenin's theorem?
Thévenin's theorem for linear electrical networks states that any combination of voltage sources, current sources, and resistors with two terminals is electrically equivalent to a single voltage source V and a single series resistor R #wikipediaactually i will explain you the way to solve problems applying this theorem consider a large network and in that network assume any resistance R about which you are asked o find the current and voltage-drop. now follow the steps below carefully1. remove the specific resistor from the circuit (open the resistor) and find the voltage across both the points(or even parallel to both the points) where the resistor is opened this is called VTH (this is called thevenin's voltage).Also dont forget to open the current sources if present.2. now to calculate the effective resistance as seen from the opened resistor short all the voltage sources and open all the current sources. and assume an arbitrary voltage V in the place of the opened resistor find current through the branch by mesh analysis and the ratio of voltage and current gives you the effective resistance fo the circuit as seen from the opened resistor. this is called Rth (thevenin resistance).now , after getting the values of VTH,RTH construct a circuit in which the given resistance R and RTH arein series with the voltage source VTH , and the so called found current is the current flowing through R in the actual circuit
Does adding resistors in series increase or decrease the overall resistance of a circuit?
Resistance in series adds together. two 100 ohm resistors in series are equivalent to one 200 ohm resistor. to make an equation out of it ( even though it is simple) you can say: Rtotal=R1+R2+R3...+Rn
What happens to the resistance in a parallel circuit when more light bulb is added?
When more light bulbs are added to a parallel circuit, the total resistance decreases because each additional bulb provides an additional pathway for current to flow. This results in an increase in the overall current flowing through the circuit, as well as an increase in the total power consumed by the circuit.
Normally a high current flows through a short circuit even if there is no change to the voltage. Why is this?
A high current flows through a short circuit even if there is no voltage change because the resistance across the short circuit is zero.
Even without current flow there can be voltage in a circuit?
Voltage is potential energy and can exist in a open circuit.
Can I just use resistors to control the current for 3 of the 4 pins in a RGB LED to change its color?
Yes you can reduce the current and therefore the brightness of each colour to change the overall colour. You could even put in three variable resistors with 3 fixed resistors to limit the maximum current. ( when you turn the pots right down to zero).
When is the current flowing in a circuit said to be very small?
The current flowing in a circuit is said to be very small when it is in the range of microamperes (10^-6 A) or even lower. This low current can be indicative of high resistance or very low power consumption in the circuit.
Are there diagonal resistors in an electric circuit?
Diagonal resistors are not a standard component in electric circuits. Resistors are typically placed in series or parallel configurations for specific purposes in a circuit. However, in more complex circuit designs, resistors can be oriented diagonally to optimize space or layout constraints.
How many pathway do parallel circuit have?
A parallel circuit consists of multiple pathways for current to flow. Each branch in a parallel circuit provides a separate path for current to travel, allowing for continuity in the circuit even if one path is broken or has higher resistance.
What causes an open circuit?
An open circuit exists when the path for electron flow is interrupted.Sometimes this is part of the circuit design; e.g., a switch to turn a light on or off.Open circuits may also be created unintentionally when a component part of the circuit fails so that it can no longer conduct electrons. A break in the wire connecting components, or a loose connection between wires, or even a broken filament in an incandescent bulb, for example.Electronic circuits may contain components (resistors, capacitors, or integrated circuits, for example) which can fail in a way that creates a break in the electron path.Particularly in an electronic circuit, it's important to be sure that the circuit is actually broken, and not simply shorted to ground. In a truly open circuit, there is no current flow. In a shorted circuit, current may be flowing in part of the circuit, but not through the whole circuit.
Why is a short circuit dangerous?
A short circuit will draw a lot of current and produce heat so there is great danger of damage and even fire
Does an electric circuit have a beaker?
No, an electric circuit does not have a beaker. A beaker is a container used for holding liquids, whereas an electric circuit consists of components like wires, batteries, resistors, and switches that allow electricity to flow in a specific path.
Three resistors having a value of 10 omes each are connected in series to a 300 volts power source what is the total resistance of this circit?
Three resistors having a value of 10 ohms each, when connected in series, have a total effective value of 30 ohms, even if they're wrapped in tissue, stuffed into a box, and stored in the back of your sock drawer. What, if anything, they're connected to makes no difference. If you take the series string of three resistors out of the box and connect it to the terminals of a 300-volts power source, then the string will conduct a current of 10 Amperes. Each resistor will dissipate 1,000 watts and heat rapidly, until the first one either melts or explodes, whereupon the series circuit will open and the flow of current will cease.
