Pengukuran Kuat Arus dan Beda Potensial Listrik

Summary

In this educational video, the instructor demonstrates a practical experiment on measuring electric current and potential difference. The session covers how to assemble a simple electrical circuit with batteries, a lamp, an ammeter, and a voltmeter. The experiment explores the relationship between current, voltage, and resistance, with observations showing how adding more batteries increases brightness, current, and voltage. The instructor explains the calculations and plots a graph to calculate resistance using Ohm’s Law. The video concludes with a clear understanding of the principles of electric circuits and their components.

Takeaways

• 😀 The practicum focuses on measuring electric current and potential difference in a circuit.
• 😀 The tools used in the experiment include a circuit board, voltmeter, ammeter, batteries, and a lamp.
• 😀 The goal of the practicum is to assemble electrical components, measure electric current, and understand the relationship between current, voltage, and resistance.
• 😀 A voltmeter measures the voltage (potential difference) in a circuit, while an ammeter measures the current.
• 😀 The experiment demonstrates how different numbers of batteries affect the brightness of the lamp, voltage, and current.
• 😀 With one battery, the current was around 0.2 amperes and the voltage was 1.5 volts, but the lamp was dim.
• 😀 With two batteries, the lamp became brighter, and the current increased to 0.3 amperes and voltage to 2.6 volts.
• 😀 Using three batteries further increased the brightness, with the voltage reaching up to 3.2 volts and the current at 0.38 amperes.
• 😀 The relationship between current and voltage was observed and graphed, showing an increase in both as more batteries were added.
• 😀 The experiment concludes that the more batteries in a circuit, the greater the current and brightness of the lamp, and the ratio of potential difference to current is known as resistance.

Q & A

What is the main purpose of this practicum?

The main purpose of this practicum is to learn how to assemble electrical components, measure electric current and potential difference, compile a graph of the relationship between electric current, potential difference, and electrical resistance, and explain the relationship between them.

What tools are required for the practicum?

The tools required for the practicum include a circuit board, voltmeter (to measure voltage), ammeter (to measure current), connecting bridges, batteries (3 x 1.5V), a switch, and a lamp.

How are the ammeter and voltmeter connected in the circuit?

The ammeter is connected in series with the circuit, while the voltmeter is connected in parallel to measure the potential difference.

What happens when one battery is used in the circuit?

When one battery is used, the lamp lights up faintly, and the ammeter shows a current of approximately 0.2 amperes, while the voltmeter reads around 1.5 volts.

How does the circuit behave when two batteries are used?

With two batteries installed, the lamp lights up brighter, the voltage increases to around 2.0 volts, and the current increases to about 0.3 amperes.

What is observed when three batteries are used in the circuit?

When three batteries are used, the lamp lights up even brighter, the voltage increases to around 2.8 volts, and the current rises to about 0.38 amperes.

How do the voltage and current change with the number of batteries in the circuit?

As more batteries are added to the circuit, both the voltage and current increase. The lamp becomes brighter, indicating a higher power output from the circuit.

What is the relationship between voltage and current in this practicum?

The relationship between voltage and current is directly proportional. As voltage increases, the current also increases, which is demonstrated by the data collected from the experiment with varying numbers of batteries.

How is the resistance of the circuit calculated from the data?

Resistance is calculated using Ohm's Law, which states that resistance (R) is equal to the change in voltage (V) divided by the change in current (I). Based on the data, the resistance was calculated to be 18.5 ohms.

What can be concluded about the effect of adding more batteries to the circuit?

The conclusion is that adding more batteries increases the brightness of the lamp, the voltage, and the current. This supports the direct relationship between voltage and current in the circuit.