To prevent excess voltage to enter in a diode or LED etc
no we not use resistance in place of diode.
As we know V=IR, by changing the voltages in the two different circuits, we can maintain the same current even we have different resistance.
Series circuit gives higher resistance compared to parallel circuit.
In electrical circuits, the resistance of a material typically increases as its temperature rises. This relationship is known as temperature coefficient of resistance.
Starting resistance in electrical circuits refers to the initial resistance encountered by a device when it is first turned on. This resistance can affect the flow of current and the performance of the device.
One way is to use Thevenin's theory and methods. Léon Charles Thévenin was a French telegraph engineer who extended Ohm's Law to the analysis of complex electrical circuits.
Multiple resistance circuits are electrical circuits that contain more than one resistor connected in various configurations, such as series, parallel, or a combination of both. These circuits are commonly used in electronic devices and systems to control the flow of current and voltage. The total resistance in a multiple resistance circuit can be calculated using different formulas depending on the arrangement of the resistors.
By connecting components in series, you are increasing the equivalent resistance (known as thevenin resistance) of the circuit. Power is equivalent to Voltage^2 / Resistance. Therefore, by increase the resistance, you are decreasing the amount of power provided by the source.
In electrical circuits, resistance is represented by the symbol omega (). Resistance is a measure of how much a material or component opposes the flow of electric current. The symbol omega is used to denote resistance in equations and circuit diagrams.
D. The total resistance is equal to the lowest resistance in the circuit
Resistance applies to both d.c. and a.c. circuits, and is determined by the resistivity, length, and cross-sectional area of a conductor.In d.c. circuits, resistance is the only opposition to the passage of current. However, in a.c. circuits, the flow of current is opposed, not only by resistance, but also by reactance. Reactance is caused by a circuit's inductance or capacitance, or both, and varies with the frequency of the supply. Like resistance, reactance is also measured in ohms.So, in a.c. circuits, the combination of resistance and reactance is called 'impedance'.Impedance is not the algebraic sum of resistance and reactance, but the vectorial sum. So if, for example, an a.c. circuit had a resistance of 3 ohms and a reactance of 4 ohms, the impedance would be 5 ohms, not 7 ohms.
Resistance in electrical circuits is caused by the interaction of electrons with the atoms in a material, which slows down the flow of electric current. This resistance is measured in ohms and can be influenced by factors such as the material of the conductor, its length, and its cross-sectional area.