# Current and voltage relationship lab What is the mathematical relationship between voltage, current and resistance? Purpose: A complete lab write‐up includes a Title, a Purpose, a Data section. In this lab, you will be exploring the behavior of electrical components connected in circuits. . Learn the relationships between current, resistance, and voltage. Lab 1. Current, Voltage and Resistance. Introduction. The TA will show you how to use the multimeter for measuring current, voltage and resistance. The TA will.

Absent student names cannot be added to the group report. Even if they were added, absent students will not receive the report and activeness marks. Current I is the rate of flow of electric charge.

### Current-Voltage Relationship

Current is measured in amperes. 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.

## Current-Voltage Relationship

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. Are the percent differences that you found within the precision predicted by the fourth band?

### lab2 [Physics Labs]

Repeat for 5 other resistors. Before moving on to the constant resistance experiment, consider the following situation and answer the questions with your partner. Imagine a trough, such as a rain gutter, that can have one end raised to different heights.

We have various types of materials we can insert into the trough all fit snuggly so no water can gush past the edges to change how water flows from the top to the bottom: For this first experiment, we will use only one of the material types.

## General Physics Experiment 2

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. 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. Use Excel to record your data. Using the formula for resistance, find the resistance at each data point. See if the material can be considered ohmic. Another way of testing a material for ohmic behavior is to check how well a straight line fits the current-voltage graph.

Some trials Find the voltage-current relationship for the devices provided resistor, lamp etc. It is well-known that the lamp filament is ohmic. However, it shows significantly changing resistance. See if you can think of the reason.

Line Current, Line Voltage, Phase Current and Phase Voltage - Three Phase Circuits - First Year Engg

Look for the stamped value of internal resistance for the voltmeter.