Pengukuran Besaran Listrik - Pertemuan 3

Summary

This video explains how to measure electrical quantities such as current, voltage, and resistance using various instruments, including ammeters, voltmeters, and multimeters. The ammeter measures the current flowing through a circuit, while the voltmeter measures voltage. The video demonstrates how to use each instrument, including adjusting the scale settings for precise measurements. It also covers the steps to set up electrical circuits in series and parallel for accurate readings. Key concepts like scale adjustment, reading measurements, and unit conversions are clearly explained, making the video a comprehensive guide to electrical measurement techniques.

Takeaways

• 😀 An ammeter is used to measure the current flowing through a circuit by connecting it in series with the circuit.
• 😀 A voltmeter is used to measure the voltage across two points in a circuit by connecting it in parallel.
• 😀 A multimeter can measure three electrical quantities: current, voltage, and resistance, all with one device.
• 😀 When using an ammeter, you should always start by selecting the highest range to avoid overloading the device.
• 😀 Ammeters have different scales for measuring current, and you should choose the appropriate scale based on the expected value of the current.
• 😀 The pointer on the ammeter indicates the current, and you must calculate the value by multiplying it by the scale factor.
• 😀 Voltmeters also require a scale adjustment for accuracy, and you should choose the correct range before taking a reading.
• 😀 The voltmeter's pointer indicates the voltage, and the value can be calculated using a similar method as with the ammeter by adjusting for scale and multiplier.
• 😀 For accurate readings, always ensure the connections are made correctly, with ammeters in series and voltmeters in parallel.
• 😀 Proper use of both the ammeter and voltmeter involves understanding the relationship between scale, range, and the electrical quantity being measured.

Q & A

What are the key electrical quantities discussed in the script?

The script discusses three key electrical quantities: electric current, electric voltage, and electrical resistance.

What is the primary function of an ammeter?

An ammeter, also called an ampmeter, is used to measure the electric current flowing through a circuit.

How does a voltmeter differ from an ammeter in terms of measurement?

A voltmeter is used to measure the electric voltage (potential difference) across two points in a circuit, whereas an ammeter measures the electric current flowing through the circuit.

What is a multimeter, and what can it measure?

A multimeter is a versatile measuring instrument that can measure three electrical quantities: electric current, electric voltage, and electrical resistance.

How do you switch the basic meter between ammeter and voltmeter modes?

To switch between ammeter and voltmeter modes on a basic meter, you need to adjust the scale selector to 'A' for ammeter or 'V' for voltmeter.

What is the significance of selecting the appropriate measurement range on an ammeter?

Selecting the appropriate measurement range on an ammeter ensures accurate readings. It allows you to set the highest range first, gradually decreasing to a more precise range as needed for the measurement.

How is the current measured using an ammeter?

To measure current using an ammeter, the ammeter is connected in series with the circuit, and the reading is taken from the scale based on where the needle points.

Why should the ammeter be connected in series with the circuit?

The ammeter needs to be connected in series to measure the current because it must become part of the path through which the current flows, allowing it to measure the flow accurately.

How is the voltage measured using a voltmeter?

To measure voltage with a voltmeter, it must be connected in parallel across the component or section of the circuit where the voltage needs to be measured.

What is the formula used to calculate the current from the ammeter reading?

The formula to calculate the current is: (Scale reading / Maximum scale value) * Measurement range. For example, if the scale reads 22, the maximum scale is 50, and the range used is 100mA, the current would be calculated as 22 * (100mA / 50) = 44mA.