Lampu 20 Watt Berapa Ampere

3 min read Jun 26, 2024
Lampu 20 Watt Berapa Ampere

Calculating the Amperage of a 20 Watt Lamp

When it comes to electrical circuits, understanding the relationship between wattage, voltage, and amperage is crucial. In this article, we'll explore how to calculate the amperage of a 20 watt lamp.

What You Need to Know

Before we dive into the calculation, let's quickly review some essential concepts:

  • Wattage (W): The rate at which electricity is used or produced, typically measured in watts (W).
  • Voltage (V): The potential difference between two points in a circuit, measured in volts (V).
  • Amperage (I): The flow rate of electric charge, measured in amperes (A).

The Formula

To calculate the amperage of a 20 watt lamp, we'll use the following formula:

I (A) = P (W) / V (V)


  • I is the amperage in amperes (A)
  • P is the wattage in watts (W)
  • V is the voltage in volts (V)

Example Calculation

Let's assume the 20 watt lamp is connected to a 220V electrical outlet. To calculate the amperage, we'll plug in the values as follows:

I (A) = 20 W / 220 V

To solve for I, divide the wattage (20 W) by the voltage (220 V):

I (A) = 0.0909 A

Therefore, the amperage of the 20 watt lamp is approximately 0.09 A or 90 mA.


Calculating the amperage of a 20 watt lamp is a straightforward process using the formula I (A) = P (W) / V (V). By knowing the wattage and voltage of the lamp, we can determine the amperage and ensure safe and efficient operation of the electrical circuit.

Remember to always follow proper safety protocols when working with electrical systems, and consult a licensed electrician if you're unsure about any calculations or connections.

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