# Current and voltage relationship lab

### Ohm's Law Lab Report [With Graph, Observations and Verification] • Ohm Law In this lab, we'll describe an experiment you can try at home to demonstrate the the relationship between voltage, current and resistance using Ohm's Law. Current-Voltage Relationship∗ Object To study the relationship of voltage and current in some electrical devices. The functional relationship of the current to the voltage that produces it is of significant . Lab: Ohmic Materials, Part One. PHYSICS LABORATORY. Experiment #3. Current, Voltage and Resistance in Series and Parallel Circuits. This experiment is designed to investigate the.

For different data runs, we will change how steeply the trough is set: What kind of water flow would you expect to see for each of the data runs? How do the pieces of this thought experiment match with the values of our lab? Have your ID card ready to scan to receive credit for your explanation. Connect the positive terminal of the power supply to the circuit board on the right side of the resistor.

Connect the negative terminal of the power supply to the COM terminal of a multimeter. On the multimeter connected to the power supply, using a circuit board lead, connect the A terminal to the left side of the resistor. Turn the dial of the multimeter to the Current section lower left corner, labeled with an A.

## Ohm's Law Lab

Using circuit board leads, connect the second multimeter across the resistor, inserting one lead on each side. Turn the dial to the voltage section top right, labeled by V. Take a series of voltage measurements when the current is set to about 0. To set the value of the current, adjust the voltage on the power supply until the multimeter reading current gives the value you want. Record Voltage and Current measurements in Table 2, in your e-journal.

Select Analyze at the top of the screen and select Linear Fit. This will fit your data to a straight line, record the value of the slope. The slope of the line should be the resistance R. Current may be measured with an ammeter. An ammeter is inserted in series with the component through which current is to be measured, as shown in Figure 1. An ammeter represents a short or path of zero resistance. This keeps the meter from affecting the operation of the circuit. Voltage V is a force known as electrical pressure. It is the force that causes current to flow in a circuit. Voltage is measured with a voltmeter. Voltmeter should be placed in parallel with the component in order to measure voltage, as shown in Figure 2. Theoretically, Voltmeters represent an infinite resistant. This allows zero current to flow through the meter, so the meter does not affect the operation of the circuit.

Figure 1 hayyan ump. A branch of an electric circuit is any portion of a circuit that can be simplified as having two terminals. The components between the two terminals may be combination of resistors, voltage sources, or other elements.

Some circuits may consist of even more elaborate combinations that are neither series nor parallel. After that, the total current can, the branch currents and voltage drops can be calculated using: The equipment is available in the lab while the components will be given at the beginning of the class as usual. Remember to use the components carefully as they will be collected at the end of the lab.

DC power supply 1. Construct the circuit in Figure 3 2. Gradually vary the voltage from 0V to 10V, 2V at a time, and measure the current through the load resistor. Complete Table 1 4.

Construct the circuit in Figure 4. These are called resistors. It is ohmic for moderate voltages and hence, provides a constant known resistance. The voltmeter that measures V and the ammeter that measures i are connected as follows to the resistor that needs measurements. This is because the ammeter is measuring a flow of charges and these charges must actually flow through the ammeter for it to be able to make the measurement.

The voltmeter, on the other hand, measures the difference of potentials between two points.

### Ohm's Law Lab | vifleem.info

Hence, its ends must be brought in contact with the two points in question. An instrument called the multimeter will be provided to you. This can be used either as a voltmeter or as an ammeter depending on what setting it is on. For any given device, measure currents for a range of voltages.