a a b a b a a d c c d c d Fig 1.3 Simple current measurement circuit Power Supply (Be sure current I control is at maximum setting) Fig 1.4 Circuit to measure resistance Procedure To measure the voltage output of the power supply, we connected the voltmeter as shown in Fig. 1.1. We made sure that the voltmeter is always connected in parallel with the voltage being measured. Before turning on the power, we set the voltmeter voltage range to a DC value higher than the highest voltage we expected to measure. This precaution must be observed with all meters in order to avoid the possibility of burning out an expensive instrument.
To read a signal in an oscilloscope it includes the following steps: voltage measurements, time and frequency measurements, pulse and rise measurements and phase shifts. Voltage is the amount of electric potential, expressed in volts, between two points in a circuit. Usually one of these points is ground (zero volts) but not always. Voltages can also be measured from peak-to-peak - from the maximum point of a signal to its minimum point. You must be careful to specify which voltage you mean.
The function of an inverter is to change a dc input voltage to a symmetrical ac output voltage of desired magnitude and frequency and the output can be fixed and variable at a fixed and variable frequency. A variable output voltage can be obtained by varying the gain of inverter which is normally found by Pulse width modulation control. In this paper we proposed the phase
According to the Ohm’s law, v=iR Where, v= voltage i= current flowing through the circuit R= resistance offered by the resistors attached in the circuit. Whereas, there is an AC analogy for the Ohm’s that is used. Here, the equation for the Ohm’s law changes to: v=iZ Where, v= voltage i= current flowing through the circuit Z= impedance Here, all the three quantities can be used as complex numbers. Z defines a quantity called impedance. Impedance acts in a similar way as resistance in a DC circuit.
Resistance of a Wire Aim: To find out how the length of the wire affects the resistance in an electric current. Variables: All the possible factors that could affect the resistance of a circuit are the temperature, length, material and width of the wire. One of these I am going to chance for my input variable and the others I will keep the same for my control variable. Input variable: I am going to experiment with the length of the wire and see how that can change the resistance. Outcome variable: What I believe shou[IMAGE]d be affected by the input variable is the resistance.
To measure the voltage we use a voltmeter. To measure the resistance you need to find the voltage and divide it by the current. There is a simple triangle that we can use to find one of these variables, provided that you know what two of the others are. [IMAGE] Ohm's law Ohm's law says that the current flowing through a metal wire is proportional to the potential difference across it providing the temperature remains constant. So he came up with this equation: Resistance, R = p.d across the wire (v) Current through the wire (I) From this information he came up with this graph: [IMAGE] This graph is an ideal ohmic conductor.
The total resistance in a series circuit is sum of all the resistances Ohm's law is the mathematical relationship between the voltage, current and resistance in an electric circuit. This law states: Voltage (V) = amps (I) x Ohms (R) V=IR The relationship between heat and resistance is demonstrated by the fixed resistor and filament light bulb experiments. When a filament light bulb is used more heat is created than when a fixed resistor was used. Therefore the filament light bulb graph has a curve, while the fixed resistor graph produces a straight line. In these graphs resistance is the gradient or voltage (v)/ current (I).
Voltage: Ohm's Law and Kirchhoff's Rules ABSTRACT Ohm's Law and Kirchhoff's rules is fundamental for the understanding of dc circuit. This experiment proves and show how these rules can be applied to so simple dc circuits. INTRODUCTION In the theory of Ohm's Law, voltage is simply proportional to current as illustrated in the proportionality, V=RI. As shown in this relation, V represent voltage which is the potential difference across the two ends of a electrical conductor and between which an electric current, I, will flow. The constant, R, is called the conductor's resistance.
Represented by the equation ΣV=0, which means v1+ v2+ v3+…+ vn=0 . A way at looking at this equation in words is by the sum of the voltage rises in the loop will equal the sum of voltage drops in the loop . By applying this principle electrical engineers can use this to determine if there is enough energy to power an entire circuit ranging from small items like a flashlight, to skyscrapers in the world’s largest cities. II. Procedure Three experiments were performed in order to prove Kirchhoff’s Voltage Law.
The amplitude of voltage across the inductor in an AC circuit is the current multiplied by the inductive reactance (V˪=IX˪). Once you have found your voltage amplitudes across the circuit, you are able to find the impedance of the circuit. To find the impedance you take the square root of all squares of the resistor plus (the inductive reactance minus capacitance reactance), Z=√R²+(X˪-Xc)². To find the phase angle you take the arctan of the inductive reactance minus the capacitance reactance divided by the resistor, ϕ=arctan(X˪-Xc)/R. The voltage and current is at its maximum is when they are in phase.