# CTE Resource Center - Verso - Electronics Systems I Task 1859759680

# Measure current in series and parallel circuits, using a multimeter.

## Definition

Measurement should include determining current, voltage, and resistance.

When working with a circuit
• connecting the meter to the circuit should be done in the power-off condition
• resistance measurements should always be made in the power-off condition to avoid blowing a fuse in the meter or damaging internal components
• negative reading(s) in a DC circuit means the leads are reversed.

Note: Black will always be placed in the ground position, while red will be in Vâ„¦mA for low-value measurements of up to 1-2 amperes and will be moved to the 10 ampere (maximum) position for higher readings.

## Process/Skill Questions

• What is a multimeter?
• How do analog and digital multi-meters compare in use, accuracy, and performance?
• How can multimeters and similar test equipment be used to measure circuit characteristics?
• How do actual and virtual test equipment values compare?
• How can multimeters be used to measure circuit characteristics of voltage and current?
• How do series and parallel measurements of current differ?

## Science

### PH.1

The student will plan and conduct investigations using experimental design and product design processes. Key concepts include
1. the components of a system are defined;
2. instruments are selected and used to extend observations and measurements;
3. information is recorded and presented in an organized format;
4. the limitations of the experimental apparatus and design are recognized;
5. the limitations of measured quantities are recognized through the appropriate use of significant figures or error ranges;
6. models and simulations are used to visualize and explain phenomena, to make predictions from hypotheses, and to interpret data; and
7. appropriate technology including computers, graphing calculators, and probeware is used for gathering and analyzing data and communicating results.

### PH.11

The student will investigate and understand how to diagram, construct, and analyze basic electrical circuits and explain the function of various circuit components. Key concepts include
1. Ohm’s law;
2. series, parallel, and combined circuits;
3. electrical power; and
4. alternating and direct currents.