Basic Electricity - Senior Secondary 1 - Moving coil instrument

TERM: 2^ND TERM

WEEK TWO

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC ELECTRICITY

Topic: MOVING COIL INSTRUMENT

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

I.) Describe moving coil instruments

II.) State the advantages and disadvantages of moving coil instruments

III.) Discuss stunts and multipliers

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

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

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

MOVING COIL INSTRUMENT

Moving coil instruments are types of measuring instruments that utilize a coil of wire suspended in a magnetic field to measure various electrical quantities such as voltage, current, or power. The coil movement is proportional to the electrical quantity being measured, allowing for precise readings.

Advantages of moving coil instruments

1. Moving coil instruments offer high levels of accuracy, making them suitable for precise measurements.
2. They exhibit a linear response over a wide range of inputs, ensuring reliable performance across different measurement scenarios.
3. They typically require low power to operate, making them energy-efficient and suitable for battery-powered applications.
4. Many moving coil instruments can accurately measure signals across a wide frequency range, making them versatile.
5. They are often robustly constructed, capable of withstanding harsh environmental conditions and mechanical shocks.

Disadvantages Of Moving Coil Instruments

1. Some moving coil instruments may have a limited measurement range, restricting their applicability in certain scenarios.
2. They can be sensitive to external magnetic fields, leading to inaccuracies if not shielded properly.
3. High-quality moving coil instruments can be relatively expensive compared to other types of measuring instruments.
4. They may have a more complex design compared to other types of instruments, requiring careful calibration and maintenance.

Stunts and multipliers

Shunts and multipliers are components used to extend the range of the instrument for measuring higher or lower values of a particular quantity, such as current or voltage.

Shunts

Shunts are low-resistance paths connected in parallel with the measuring instrument. They allow a portion of the current to bypass the instrument, effectively reducing the amount of current passing through it. Shunts are typically used to measure high currents that exceed the direct measurement range of the instrument.

Multipliers

Multipliers are resistive components connected in series with the measuring instrument. They increase the effective voltage or current applied to the instrument, allowing it to measure higher values than its direct measurement range would normally allow.

EVALUATION: 1. What do you understand by moving coil instruments

2. Mention 3 advantages of moving coil instruments
3. Mention 3 disadvantages of moving coil instruments
4. Differentiate between stunts and multipliers

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively