# How do you calculate amps for lights?

## How do you calculate amps for lights?

A simple formula for calculating amps is to take the watts and divide that by the volts. So, for instance, if the wattage of the lighting fixture you’re working with is 60 and the volts are 12, divide 60 by 12 and you will get five, which are the amps.

### How many amps are in a string of 100 Christmas lights?

If you use 1,000 incandescent mini lights the total watts used is about 408, whereas using the same amount of LEDs, would only be 69 watts. The incandescent string lights can only have 5 sets connected end-to-end, which mean you would need to use two plug outlets.

How much current do Christmas lights draw?

How Much Electricity Do LED Christmas Lights Use?

Type of Light Bulbs Per Set Set Wattage
Incandescent Mini Light 50 20.4 watts
Incandescent Mini Lights 100 40.8 watts
Incandescent C9 Stringer Set 25 175 watts
LED Mini Lights (Conical or M5) 50 3.45 watts

How many Christmas lights can you have on a 20 amp circuit?

For a 20-watt strand, that’s 10.5 string lights connected in series. Don’t forget to sum the wattage you’re plugging into each outlet on the circuit, making sure not to exceed maximum wattage (1,440/1,920).

## How do I figure out how many amps I need?

Divide the number of watts required by the volts to determine the needed amperage. For example, a 120-watt device, requiring 1,200 volts requires 10 amps.

### How many amps is a strand of Christmas lights?

Since each string is 40.8 watts, we know that each string needs 0.34 amps (40.8÷120). Five of those together is 1.7 amps. The power strip has 6 plugs on it. 1.7 x 6 = 10.2 amps.

How many amps do outdoor Christmas lights use?

Standard household electrical outlets are on circuits that are rated for at least 15 amps of electrical current. Newer homes also have a lot of 20-amp circuits, including the outlets in the garage and outdoors. Lighting circuits (which often include outlets) typically are 15-amp.

How much electricity do lights use?

Light Bulbs A LED light bulb uses just seven to ten watts while a fluorescent light bulb consumes 16-20 watts, an incandescent light bulb will use 60 watts typically and cost about 0.6 cents an hour to run, according to the energy use chart.

## How much electricity does a strand of Christmas lights use?

A string of 25 incandescent C9 bulbs — the big plump ones often used outdoors — uses 175 watts of electricity, which works out to a whopping \$15.12 to run over a season (assuming 12-hour-a-day operation for 45 days).

### What size breaker do I need for Christmas lights?

Short Answer: For a 20-amp breaker don’t exceed 1900 watts if it is dedicated to only Christmas lights. For a 15-amp breaker, don’t exceed 1400 watts. Keep in mind that if the circuit is shared, these numbers must be modified.

How do you calculate electric current?

If the voltage (V) and resistance (R) of any circuit is given we can use the current formula to calculate the current, i.e., I = V/R (amps).

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