How To Size Power Supplies by Pete Peters

Slides:

Advertisements

Similar presentations

11.4 The Rate at Which Energy is Used. We use electrical power every day in many different ways. What is power? Power is how rapidly an appliance uses.

Advertisements

E1 – Electrical Fundamentals

Ohms Law Physics Dr. Robert MacKay. Voltage (Volts) Electrical Pressure V.

Ohm’s Law Physics Dr. Robert MacKay.

Amateur Radio Technician Class Element 2 Course Presentation ELEMENT 2 SUBELEMENTS T1 - FCC Rules, station license responsibilities T2 - Control operator.

Holiday Lighting Tips Compliments of Outdoor-Christmas-Decorations.net.

Smart Home Lighting Design

DC Circuit – Practice Problems Problem 1 Problem 1 – Parallel bulbs, ceiling lamps and you. Problem 2 Problem 2 – The Current Issue of Powerful Computing?

The first step in recording information on an electrical panel is to list the circuits according to the plan, realizing that each slot in the panel is.

1 Applying Math to Wire Sound Using formulas and conversions to wire up sound.

Beat the Computer Drill Divide 10s Becky Afghani, LBUSD Math Curriculum Office, 2004 Vertical Format.

3 Ohm’s Law Chapter Topics Covered in Chapter 3

Circuits & Circuit Diagrams

Power & Energy in Electric Circuits Series Circuits

Unit 7 Parallel Circuits

Parallel Circuit electricity has more than one path to follow total amps are equal to the sum of the individual amps total watts are equal to the sum of.

Example ECE 201 Circuit Theory 1. A load having an impedance of 39 + j26 Ω is fed from a voltage source through a line having an impedance of 1.

1. Draw a series circuit diagram with 4 lamps

Electricity Calculating Electric Power When installing new appliances, equipment, tools, or any type of electrical convenience, it is important to know.

Electric Circuits and Power Page 706. Ohm’s Law Resistance is equal to the voltage divided by the current. Resistance = Voltage Current Ohms ( ) = Volts.

1 DC ELECTRICAL CIRCUITS POWER. 2 DC ELECTRICAL CIRCUITS Power is the rate at which electrical work is done in a specific amount of time. Earlier you.

Use Ohm’s Law to solve the following equations.

Ohm’s Law Review. Division Review 15 ÷ ÷ ÷ 2.3.

 Over 400 deaths occur annually from electric shock  Half of all deaths occur with low voltage outlets  On the job site, one death per day and

Circuits & Electronics

Electrical Review Electricity Resistance Insulator

Basic Electrical Theory: Understanding Ohm’s Law Copyright © Texas Education Agency, All rights reserved.

S.MORRIS 2006 ELECTRICAL CIRCUIT CALCULATIONS More free powerpoints at

Math as Problem-Solving w Active Physics asks students to problem-solve w Some of this problem-solving involves math w Some of the math is encoded in the.

4.2.3B Electrical Power What About Watts?. Power Law Moving electrons (current) requires ENERGY How much energy gets used depends on: Strength of push.

Calculating Electricity

Chapter 6 Ohm’s Law, Work, Energy and Power. 16 V.

2 The Watt is the SI unit of Electrical Power. It is the “work done” by electricity, and is a value of work generated by 1 Amp flowing at a voltage of.

Electric Current. In this session we will, Review how we measure electric charge Discuss voltage and electric current Look at electric current in batteries.

Electrical Quantities

Chapter 6 Ohm’s Law, Work, Energy and Power. 16 V.

© Oxford University Press 2011 IP The National Grid: Power transmitted The National Grid: Power transmitted.

Electrical Circuit Theory. What ever the source of the power A.C / D.C. the electricity flows the circuit due to the movement of electrons. If the circuit.

Electricity Calculating Electric Power This lesson is from Virginia Tech and has not been edited by the Georgia Curriculum Office.

Energy and Power. Energy The ability to do work. Measured in Joules.

Technical English Unit 43: Current, Voltage and Resistance Dr. Basil Hamed Technical English Islamic University of Gaza April, 2016 Dr. Basil Hamed IUG1.

Unit 2 Electrical Quantities and Ohm’s Law

Current and Power Calculations Practice Math once again!!!

Chapter 6 Ohm’s Law, Work, Energy and Power. ResistanceCurrentVoltage 4Ω4Ω4A 16V.

Unit 43: Current, Voltage and Resistance Dr

Unit 43: Current, Voltage and Resistance Dr

Electrical Systems Series Circuits Parallel Circuits Electrical Power.

Efficiency Hair dryer TV Lamp Toy Radio Heater Answer

Electricity, Sound and Light

Current, Voltage and Resistance Chapter 43

Energy and Power for APES

Unit 43: Current, Voltage and Resistance Dr

Electric Circuits Part 2: power With Ms. Box.

Ohm’s Law The relationship between voltage, current and resistance is known as Ohm’s Law: V = IR Voltage (V) = Current (I) x Resistance (R) Volts.

Basic Electrical Theory: Understanding Ohm’s Law

Basic Electrical Calculations

Current, Voltage and Resistance Unit 43

Electric Current.

CHAPTER 3 Ohm’s Law, Power.

18 Chapter Circuit Types and Ohm’s Law. 18 Chapter Circuit Types and Ohm’s Law.

Energy and Power for APES

Electric Power.

Relationships in Circuits

Incandescent Lamp Characteristics

Voltage, Current and Resistance

FIGURE 4–1 All complete circuits must have a power source, a power path, protection (fuse), an electrical load (light bulb in this case), and a return.

Presentation transcript:

How To Size Power Supplies by Pete Peters

Watts Law P = Watts V = Voltage I = Amps To Find Desired Value Cover Letter and Perform Math P= I x E V= P / I I = P / E

Power Supply Useable Watts To find the Total Wattage (P) of a power supply, multiply the Volts (V) x Amps (I) Total Wattage X.8 = Useable Watts Example: A 120 Volt, 4 amp power supply has a total wattage of 480 Watts. Useable Watts = Total Wattage times.8 = 480 Watts x.8 = 384 Useable Watts Remember

A 100-Watt Power Supply needs 120 Volts to operate. How many Amps will the power supply use?.83 Amps = 100 Watts (P) / 120 Volts (V) (50) M5 LED lamps need 120 Volts to operate and use.025 Amps each. How many Watts will the power supply need to supply? 150 Watts = 120 Volts (V) x.025 Amps (I) x 50 Lamps The label on your power supply is damaged. You can only read the Wattage (W) 100 and the Amperage (I) 8. Use Watts Law to find out what voltage the power supply puts out. Voltage = P (watts) divided by I (amps) 100 Watts(P) / 8 Amps(I)= 12.5 Volts (V) Watts Law Examples

Sizing Your Power Supply 1) Determine the Load you will need. This is done by finding the voltage and amperage of the load or finding the total wattage of the load. 2) Use Watts Law to find the total wattage or use the wattage given on the load (light) and multiply the wattage by the number of loads (Lights). 3) Multiply the total wattage by this will allow a 20% increase in our Total Wattage. The amount calculated will be the size in watts for the Power Supply. 4) Remember– we do not want to operate our Power Supply at more than 80% of the Total Wattage. This is why we Multiply by 1.2. Example: You want to power eighty MR16 LEDs. Each LED is labeled as 12V 1.5W. This means that each MR16 requires 12 Volts to operate and uses 1.5 Watts each. Multiply the number (80) of MR16s times the 1.5 Watts. This equals 120 Watts. Now multiply by 1.2 times 120 Watts. This equals 144 Watts. You need a Power Supply that delivers 12 Volts and 144 Watts.