Limiting Maximum Current of the Power Supply

Slides:

Advertisements

Similar presentations

Chapter 3 Ohm’s Law.

Advertisements

How We Load Power Supplies. All sources have an EMF. EMF is the open terminal voltage of the battery. All sources have a certain amount of internal resistance.

 Fuses and Circuit Breakers are switches that act as safety devices ◦ Addition of appliances reduces the resistance and increases the current ◦ Energy.

Circuits Energy & Environment. Simple Circuit G -ve +ve Wire Lamp Switch Fuse Battery Power Source Safety Device Controlling Device Purpose Connect circuit.

BASIC ELECTRICITY n VOLTAGE n AMPERAGE n OHMS Page 242Autobody Text.

Chapter 5 Series Circuits.

Calibration is a comparison between measurements of known magnitude with one device and another measurement made in as similar a way as possible with.

Series vs. Parallel Circuits Physics Mrs. Tobler.

7.2.3 Student Book © 2005 Propane Education & Research CouncilPage Identifying Procedures for Measuring Resistance Between Two Given Points in.

5.2: Circuits, Ohm’s Law, Electrical Power 2/6/13.

Electrical Power Systems

Electrical Circuits and Ohm’s Law Monroe. There are two main kinds of circuits. 1.Series circuits a. Each part of the circuit is wired to the next b.

Meter Accuracy DC Volts ±(0.1% of the reading + 1 digit) DC Amps

Electric Circuits. In an electric circuit, an energy source and an energy consuming device are connected by conducting wires through which electric.

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.

Parallel Circuits – Chapter 5

Circuits and Ohm’s Law Objectives: 1. Gain an understanding of Ohm’s Law. 2. Compare and contrast the movement of current through a series and parallel.

1 of 7 Displays Voltage Displays Current Adjusts Voltage Output voltage is available at these terminals; the + is at a higher voltage than the - Photo.

Circuits with more than one resistor, then Watt happens? Series and Parallel are the 2 ways of connecting multiple resistors.

35 Electric Circuits In a parallel circuit, each device operates independent of the other devices. A break in any one path does not interrupt the flow.

Electrical circuits. Intensity (I): Number of charges that flow past a given point every second. Measured in Amperes (A). Wires that carry the electrical.

RESISTANCE OF A SYSTEM OF RESISTORS Resistance can be joined to each other by two ways: Electricity Combination of Resistors 1. Series combination 2. Parallel.

Limiting Maximum Current of the Power Supply. Which Meter has almost zero resistance? Current meter R i  0  e.g.,  R i 

Lesson Measuring and Calculating Electricity. Interest Approach § Have you or your parents ever been using several appliances in the kitchen and had a.

35 Electric Circuits Electrons flow from the negative part of the battery through the wire to the side (or bottom) of the bulb through the filament inside.

Electric Currents. The Electric Battery Electric Cell.

Chapter 8. Ohm’s Law  George Ohm experimented with circuits and came up with a mathematical relationship relating voltage, current and resistance in.

VOCABULARYOBJECTIVES  Parallel circuit  Kirchoff’s current law  Short circuit  Describe how current divides in a parallel circuit  Determine the voltage.

Drawing a Circuit When illustrating an electrical circuit for everyone to understand, you must draw a standardized picture called a schematic.When illustrating.

Concepts of Engineering and Technology Basic Electricity and Electronics: DC Circuits Copyright © Texas Education Agency, All rights reserved. 1.

Unit 13 Electric Circuits

Thevenin and Norton Equivalent Circuits 1 THEVENIN’S THEOREM Used to help simplify complex circuits States that any linear circuit is equivalent to a single.

Amperes, Volts and Ohms. We use different units to measure different things: We use different units to measure different things: Time – minutes Time –

Section Objectives  Describe how current divides in a parallel circuit.  Determine the voltage across and current through each branch of a parallel.

+ Electric Circuits Parallel Circuits and Diagrams.

Electric Circuits Chapter Notes. Electric Circuits Any path along which electrons can flow is a circuit A gap is usually provided by an electric.

Electricity. An electric current is a flow of ELECTRONS flowing through wires and electronic components.

Current Electricity Sections 2-2 & 2-3.

Basic Electronics for Computer Engineering

ELECTRICAL CIRCUITS.

Electric Circuit Components are connected together with electrical wire to form a closed loop. Components are represented by symbols 1.

ELECTRICAL CIRCUITS All you need to be an inventor is a good imagination and a pile of junk. -Thomas Edison.

Chapter 5 Review Questions and Circuit Analysis

Chapter 5 Review Questions and Circuit Analysis

Electrical Safety in the Home

Series and Parallel Circuits

FIGURE 5-1 A series circuit with three bulbs

Unit 2.4 Electric Circuits

Ch 35 Electric Circuits Electric Circuits.

Ohm’s Law If the current I = 0.2A and the resistance R = 1000 ohms, solve for voltage. If V = 110V and R = ohms, how much current is flowing through.

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 circuits Electrical circuits Electrical properties Ohm’s law

Source Transformation

Kirchoff’s Laws.

Any path along which electrons can flow is a circuit.

Electrical Quantities

Kirchoff’s Laws.

Comparing Series and Parallel Circuits

Ohm’s Law – The relationship between Current, Voltage and Resistance.

What formula is used to calculate current in a circuit?

Kirchhoff’s Laws.

Ohm’s Law & Circuits Chapter 7.2 & 7.3.

Series and Parallel Circuits

Electric Circuits Chapter 35.

Kirchhoff’s Laws.

SCI 340 L43 circuits Group Work

Series and Parallel Circuits

FIGURE 5-1 A series circuit with three bulbs

ELECTRICAL CIRCUITS All you need to be an inventor is a good imagination and a pile of junk. -Thomas Edison.

Presentation transcript:

Limiting Maximum Current of the Power Supply

Which Meter has almost zero internal resistance? Current meter Ri  0 W e.g., Ri = 0.001 W

What might happen if you connect the Current Meter across (in parallel) a Power Supply by mistake? A high current will flow through the circuit. As a result: the Current meter will burn out, or, the Power Supply will burn out, or, the connecting wire will burn out. Because, a very high amount of current will flow through the meter, as there is no resistance ( 0 W) in the circuit. According to Ohm’s Law: I = V/R = 5 V/0 W =  (infinite Ampere) Power Supply VS = 5 V Ri  0 W ?

Current limiting circuitry To Protect your Current meter and the Power Supply itself, the Power Supply is equipped with current limiting circuitry.

Set Maximum Current of the Power Supply to 100 mA For most of your experiments 100 mA is enough current. At the same time it is within the safe limit of the current meter (which has a fast blow fuse of 500mA).

Procedure for setting Maximum Current of the Power Supply to 100 mA 1. Adjust the Power Supply voltage to 5 V (or the voltage desired). 2. Turn the current limiting knob (right-hand side knob) counter clockwise to 0 mA. 3. Connect a wire between the Positive (+) terminal and the Negative (-) terminal (to make a short circuit). 4. Turn the current limiting knob (right-hand side knob) clockwise to set the current to 100 mA (5 small divisions or, 1 large division). 5. Remove the wire (used to short circuit) between the Positive terminal and the Negative terminal of the power supply for it’s normal operation. Note: Do not short circuit the power supply for a long time or unnecessarily.