Electrical Circuits 8 3.1 j Explain the design and use of circuits to explore variation of resistance – including for lamps, diodes ntc thermistors and.

Slides:

Advertisements

Similar presentations

IV Characteristics Electricity Lesson 4.

Advertisements

Current-Voltage Characteristics of a bulb In this experiment you are going to investigate how the current through a bulb changes according to the.

P2.3.1 – Static Electricity. Objectives, to understand that: –When certain electrical insulators are rubbed together they become electrically charged.

What is electric current? What is current measured in? What is the difference between a series and parallel circuit? How many circuit symbols can you draw?

Prepared By: Shakil Raiman.  Resistors is a device which can reduce the current.  The resistance of a wire is calculated by R=V/I (which comes from.

LDRs & Thermistors Noadswood Science, 2012.

P6 Flavour Sharing Charging Logic gates Motoring and Generators Resisting Computer circuits Transformers lessons 8 Home works End of topic assessment.

Electric Currents Topic 5.2 Electric Circuits. Electromotive Force Defining potential difference Defining potential difference The coulombs entering a.

UNIT 1: ELECTRICITY AND ELECTRONICS (PART 3) TECHNOLOGIES ESO 3.

Twenty Questions Electronics. Twenty Questions

Explaining the shape of the current-voltage graph for the bulb

How hot is it? Current – Voltage graphs Dependence of resistance on heat LDRs and thermistors.

Investigation 16B  Key Question: What is the relationship between current and voltage in a circuit? Resistance and Ohm’s Law.

P2: Electricity Booklet 1 Name: _______________________ Teacher: _______________________ You are reminded for the need to complete all work to the best.

Your Hospital What are sensing circuits ?

IP Circuit symbols © Oxford University Press 2011 Circuit symbols.

RESISTORS Always remember…… V = IR (V= voltage in volts; I = current in amps; R = resistance in ohms)

Turn up the heating The electric current Heating effects of a current Voltage – Current graphs.

STARTER They all detect something and then respond But how?

5.3 More current – pd graphs The resistance of a filament lamp increases with increased temperature The resistance of a diode depends on the p.d. (voltage)

Electricity 2 Thomas Edison Lesson Objectives I know some circuit symbols for common components. I know what is meant by resistance I know.

Additional Physics – Forces L/O :- To know how LDR’s are affected by light intensity LDR’s Exam Date -

Twenty Questions Electronics. Twenty Questions

18240 Element two - Components INPUTS OUTPUTS PURPOSE TYPICAL USE.

Physics Exercise Radiation. Part One Emissivity, e.

Physics Exercise Radiation. Part One Emissivity, e.

Electrical Circuits Revision. KEY WORDS: Insulating Electron Attract Repel Resistance Series ASSESSMENT: P2 REVISION – CHAPTER 4 – Current Electricity.

Investigating Non-Ohmic Resistors Learning Outcome Set up the circuits in order to calculate or directly measure the resistance of variable resistors.

6.2 ELECTRONICS. CAPACITOR An electrical device used to store electrical charge.

Electronics revision Electronics Revision Part 1.

Starter: use Pg to complete the table

Electric circuits lesson 2

Current is the rate of flow of….. Energy Charge protons

A –Level Physics: Electrical Quantities: Potential Dividers

Start + end ???? 1.2 Electric circuits Lesson starter

Connect 4 Change the terms in the following template to customize Connect 4 for any topic. You will need to copy one copy of one of the two templates.

P2 Topic 2: Controlling and using electric currents

ELECTRONICS Learning Objective To know how the thermisistor works

ELECTRONICS Learning Objective To know how the thermisistor works

Electrical Circuits lesson 3

Starter Stick in the following (in the right places):

Revisit that current is a flow of charge.

Resistance By the end of this lesson, you will be able to…

EDEXCEL IGCSE PHYSICS 2-4 Electrical Resistance

LDRs and Thermistors.

Series Circuit – 1 bulb Series Circuit – 1 bulb.

Foundations of Physical Science

Transistor & Voltage Divider

RESISTORS A resistor is used to reduce the flow of electricity in an electric circuit. Resistorscome in fixed or variable types.

Be able to describe how the resistance of LDRs and Thermistors varies.

Series and parallel circuits

Match the circuit symbols How many of these can you name?

P6 – Electricity for Gadgets

ELECTRICAL CIRCUIT BOARDS

A –Level Physics: Electrical Quantities: Semiconductors

Ohms Law required Practical

Review Read the comments I have written in your book.

Resistance WALT: Describe the relationship between resistance and current and explain how different components can change resistance Starter: Draw the.

Designing Electric Circuits

P2 Topic 2: Controlling and using electric currents

P2 Topic 2: Controlling and using electric currents

Equipment REQUIRED PRACTICAL.. This is a series of 3 practicals with graphs that need to be drawn. This will take multiple lessons Guidance for each practical.

Resistance components & Power

P2 REVISION – CHAPTER 2 – Electricity Answers

P2 - Physics Circuits.

Describe the action of thermistors and light- dependent resistors and show understanding of their use as input transducers Thermistor A transducer is an.

Presentation transcript:

Electrical Circuits 8 3.1 j Explain the design and use of circuits to explore variation of resistance – including for lamps, diodes ntc thermistors and LDR’s

Starter What is the component? What is function of the component? How does current change with voltage? How does the resistance of the component change? Why?

We are going to investigate the resistance in aLDR and a thermisitor? LDRs (light-dependent resistors) are used to detect light levels, for example, in automatic security lights. Their resistance decreases as the light intensity increases. Thermistor - are used as temperature sensors, for example, in fire alarms. In the most common type of thermistor, the resistance decreases as the temperature increases

LDR investigation You will carry out an investigation to measure the resistance of an LDR at different light intensities. An LDR is an electric component whose resistance varies with light intensity. Method: Connect the LDR to a multimeter and set it to 20kΩ, Place a desk lamp so that the bulb is 10cm away from the LDR and record the resistance Vary the desk lamp distance and measure the resistance accordingly. Light intensity can be expressed as an ordered variable: bright, medium and dim. Plot a graph of resistance against light intensity.

Thermistor investigation You will carry out an investigation to measure the resistance of a thermistor at different temperatures. A thermistor is an electric component whose resistance varies with temperature. Method: Heat 250ml of water using a bunsen burner to 80ºC then turn the bunsen burner off, Immerse the thermistor in the hot water, Connect the thermistor to a multimeter and set it to 20kΩ, Record the temperature of the water as it cools down Record the resistance of the thermistor for each corresponding temperature Plot a graph of resistance against temperature.

Thermistors and LDRs can work as Sensors: A sensor is a component that allows a physical quantity to change its resistance and hence control the amount of current flowing in a circuit. A A Light Dependent Resistor/ LDR: Its resistance decreases as the light intensity increases. (The higher the illumination, the higher the current Temperature Dependent Resistor /Thermistor: Its resistance decreases as the temperature increases. (The higher the temperature, the higher the current). In this circuit, the LDR can work as a lightmeter. The higher the ammeter reading, the higher the illumination. In this circuit, the thermistor can work as a thermometer. The higher the ammeter reading, the higher the temperature.

Results Plot graph – Write conclusion using key language. Light intensity / temperature on the x axis Resitance on the y axis Write conclusion using key language. Resistance Light intenisty Temperature Thermistor LDR increase decrease

Plenary Pair/ share Explain the shape of graph and conclusion to another a person who investigated the other component. Class You will explain their conclusion to the class.