Basic Electricity - Senior Secondary 2 - Measuring instruments

TERM: 2^ND TERM

WEEK ONE

Class: Senior Secondary School 2

Age: 16 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC ELECTRICITY

Topic: MEASURING INSTRUMENTS

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.) Define measuring instruments

II.) State the operational range based on types of measuring instruments

III.) Identify the parts and uses of measuring instruments

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

MEASURING INSTRUMENTS

Measuring instruments are devices used to quantify physical quantities such as voltage, current, temperature, pressure, or any other measurable parameter. In electricity, measuring instruments are specifically designed to measure electrical parameters like voltage, current, resistance, and power. These instruments help technicians and engineers analyze, troubleshoot, and maintain electrical systems. Common examples include voltmeters, ammeters, multimeters, oscilloscopes, and wattmeters.

Operational range of measuring instruments

The operational range of measuring instruments varies depending on the type of instrument and its specific model. However, generally speaking:

- Voltmeters can measure voltages ranging from millivolts to kilovolts.

- Ammeters can measure currents ranging from milliamps to kiloamps.

- Ohmmeters measure resistance typically from fractions of an ohm to megaohms.

- Multimeters typically combine the functions of voltmeters, ammeters, and ohmmeters, covering similar ranges.

- Oscilloscopes display voltage waveforms over a range of frequencies and amplitudes.

- Wattmeters measure power, usually from milliwatts to kilowatts.

Parts and uses of measuring instruments

Common parts of measuring instruments include:

1. Display: Shows the measured quantity, either through analog gauges or digital readouts. It's provides a visual representation of the measured quantity, allowing users to read and interpret the measurement.
2. Probes or Leads: Connect the instrument to the circuit or device being measured.

It facilitates the connection between the measuring instrument and the circuit or device being measured, ensuring accurate data acquisition.

3. Switches or Buttons: Allow selection of measurement parameters, such as range or function. It enables users to select the desired measurement range, function, or mode, ensuring precise and appropriate measurements for different scenarios.
4. Dial or Knob: Adjusts settings such as range, frequency, or sensitivity. It's allows users to adjust settings such as range, frequency, or sensitivity to customize measurements according to specific requirements or conditions.
5. Input Terminals: Where probes or leads are plugged in to make the electrical connection. It provides secure connection points for attaching probes or leads, ensuring stable and reliable electrical contact between the measuring instrument and the circuit or device under test.
6. Function Selector: Allows switching between different measurement modes in multifunction instruments. It's allows users to switch between different measurement modes or functions in multifunction instruments, expanding their versatility and utility across various applications.
7. Calibration Controls: Enable adjustment or calibration of the instrument for accuracy. It enables users to calibrate the measuring instrument periodically to maintain accuracy and reliability, ensuring consistent and precise measurements over time.
8. Power Source: Provides power for operation, typically batteries or AC power. It's provides the necessary power for the operation of the measuring instrument, ensuring continuous and reliable functionality during measurement tasks.

EVALUATION: 1. What are measuring instruments?

2. Identify and state the operational range of 5 measuring instruments that you know
3. Mention 5 common parts of measuring instruments and state their uses

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively