The greatest resistance is two bulbs in series. The equivalent resistance is series is R1+R2 while in parallel the resistance is R1R2/(R1 +R2). R1 +R2 is greater than R1R2/(R1+R2); e.g. if R1=R2 = R the series resistance is 2R and the parallel resistance is R/2.
RSeries = SummationI=1toN (RI)
Which means that if you have two bulbs in series of resistance x, then the effective resistance is 3x, while two bulbs would be 2x.
Yes, it is true that x would be slightly different, because of the temperature coefficient of the bulbs, but it is monotonically so, meaning that the resistance of 3 bulbs, while slightly less than 3x, would still be greater than 2x.
Practically, you can tell by placing an ammeter in series with the two or three bulbs, and you will see that the current is less with three bulbs. Assuming that the voltage is the same in both cases, you can simply calculate the resistance with Ohm's law as R = E / I.
If you had three bulbs in series with resistances of R1, R2 and R3 then RTotal = R1 + R2 + R3.
The sum of the currents through the branches of a simple parallel circuit is the current that flows through the voltage source.Kirchoff's current law: The signed sum of the currents in a series circuit is zero. The sum of the currents in the branches represents one effective path, which is in series with the voltage source, so the two effective currents must be the same.
Well, you should really measure the open-circuit voltage and the short circuit current both under dark and light conditions and then compare them to fully characterize a solar cell. Measuring the open-circuit voltage means measuring the voltage across the cell when no current is flowing (i.e., with a LARGE resistance as a load on the cell). Measuring the short-circuit current means measuring the current when the voltage across the circuit is essentially zero (i.e., with a VERY SMALL resistance as a load on the cell--thus, "short-circuit" current).
1) a bridge based on the principle of Wheat stone's bridge that is used to compare two nearly equal resistances and to determine values of low resistances and the specific resistance of a wire. It differs from a meter bridge because additional resistances of similar magnitudes are included at either end of the meter wire.
Depending on the value, it varies. Using a multimeter set for Kilohms resistance, check that it appears open circuit. This may be hard to determine, due to other components in circuit. It should NOT show zero resistance. Electrolytic capacitors above 1 microFarad will show some storage of charge. Using the meter with the probes one way, there should be a percepible rise of resistance. Reverve the leads and you should get an intial negative value followed by a slow rise in resistance. If there is no perceptible rise, it could be open circuit. If it shows Zero, it will indicate a dead short.
The brightness of each bulb in a parallel circuit is the same as the brightness of a bulb in a simple circuit. By Kirchoff's voltage law, each element of a parallel circuit has the same voltage drop across it. With the same voltage, the same type of bulb will dissipate the same power, and have the same brightness.
The voltmeter has an internal resistance, which should be as high as possible. As this resistance draws current from the circuit under test, it will affect circuit operation. This is more pronounced in a high impedance circuit because the current drawn flows through higher resistances.
The voltmeter has an internal resistance, which should be as high as possible. As this resistance draws current from the circuit under test, it will affect circuit operation. This is more pronounced in a high impedance circuit because the current drawn flows through higher resistances.
The sum of the currents through the branches of a simple parallel circuit is the current that flows through the voltage source.Kirchoff's current law: The signed sum of the currents in a series circuit is zero. The sum of the currents in the branches represents one effective path, which is in series with the voltage source, so the two effective currents must be the same.
That depends on whether the bulbs are wired in series or in parallel.
Well, you should really measure the open-circuit voltage and the short circuit current both under dark and light conditions and then compare them to fully characterize a solar cell. Measuring the open-circuit voltage means measuring the voltage across the cell when no current is flowing (i.e., with a LARGE resistance as a load on the cell). Measuring the short-circuit current means measuring the current when the voltage across the circuit is essentially zero (i.e., with a VERY SMALL resistance as a load on the cell--thus, "short-circuit" current).
There are several methods for measuring resistance, each suited to different situations and levels of precision. Here are the most common methods: Ohmmeter: This is the most common method for measuring resistance. An ohmmeter is a device that directly measures resistance. It typically consists of a voltage source, an ammeter, and a variable resistor. When connected to a circuit, it passes a known current through the component whose resistance is being measured and then measures the voltage drop across it. The resistance is calculated using Ohm's Law (R = V/I), where R is resistance, V is voltage, and I is current. Multimeter: A multimeter combines several measurement functions into one device, including voltage, current, and resistance. Most modern multimeters have a setting for measuring resistance (Ohms), and they function similarly to standalone ohmmeters. Bridge Circuits: Bridge circuits, such as Wheatstone bridge, are used for precise resistance measurements. They compare the unknown resistance with a known resistance in a balanced bridge circuit. The bridge is adjusted until there is no current flow through the detector, indicating that the bridge is balanced. Then, the resistance of the unknown component can be calculated based on the known resistances and the bridge configuration. Kelvin Bridge: A Kelvin bridge is a modification of the Wheatstone bridge and is used for accurate measurement of low resistances. It eliminates the resistance of the connecting leads by using four terminals instead of two. Meters and Galvanometers: Galvanometers are sensitive instruments that measure small currents. By applying a known voltage across the unknown resistance and measuring the resulting current using a galvanometer, the resistance can be calculated. Digital Methods: Modern digital techniques use microcontrollers or specialized integrated circuits to measure resistance. These methods often offer high accuracy and precision. Resistance Temperature Detectors (RTDs): RTDs are sensors whose resistance changes with temperature. By measuring their resistance and knowing their temperature coefficient, you can indirectly measure temperature. Four-Wire Measurement: Also known as Kelvin sensing, this technique is commonly used to measure very low resistances accurately. It eliminates errors caused by the resistance of the connecting wires by using separate pairs of leads for current and voltage sensing. Each method has its advantages and is suited to different applications, ranging from simple household measurements to precise laboratory measurements.
when a car is speeding up how does the forward force and air resistance compare
1) a bridge based on the principle of Wheat stone's bridge that is used to compare two nearly equal resistances and to determine values of low resistances and the specific resistance of a wire. It differs from a meter bridge because additional resistances of similar magnitudes are included at either end of the meter wire.
why armature resistance is very low as compare to field resistance in dc motor
if the resistance of bulb A is 2x that of B then there will be twice as much voltage across it (ratio 2:1 ). both voltages shall equal the system voltage assuming they are in series and there are no other components in the circuit if the bulbs are in parallel the voltage across them will be equal and that of the system
The current of one bulb (two bulbs shorted) would be about1 three times the current of three bulbs.1 I say "about" because resistance is a function of temperature, and running three times the current through one bulb will make that one bulb much hotter, increasing its resistance. It might also burn out the bulb.
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