May 6, 2009 In our lab yesterday, what device did we use to measure the current? Voltage? What causes circuits to become overloaded?

Slides:

Advertisements

Similar presentations

Chapter 20 Electricity.

Advertisements

What Are Circuits? What is a closed circuit?

Factors Affecting Resistance

Circuit elements Resistors Resistance The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the.

Electric Circuits Chapter 20.3.

Meter Lab Introduction to Electricity Assignment for tomorrow: Read chapter R1.

ELECTRIC CURRENT TEST REVIEW. A. Series B. Parallel C. BothD. Neither 1. C Potential difference and current are directly related. 2. A A(n) _____ circuit.

Use Ohm’s Law to solve the following equations.

Key Ideas What is a closed circuit?

Electric Circuits A circuit is a path where a current can flow If the flow is to be continuous, the can be no gaps in the path Introduce gaps in the form.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 Circuits Objectives Use schematic diagrams to represent.

13 Electric Circuits.

Chapter 17.3 – Circuits electric circuit – a set of electrical components connected such that they provide one or more complete paths for the movement.

2- Ohm’s law and Power. The total amount of charge that passes through a wire at any point per unit time is referred to as : 1) current 2) electric potential.

34.11 Electric Power Electric power is equal to the product of current and voltage.

Electrical Resistance and Ohm’s Law Electric circuits are used to convert electrical energy into some other form of energy we need.

Ohm’s Law & Electrical Power. Resistance - the tendency for a material to oppose the flow of electronsResistance - the tendency for a material to oppose.

Electrical Potential (Voltage) Answers (Page 303)

Section 3.3 Measuring Energy Input and Output 1 p

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.

ElectricitySection 3 Section 3: Circuits SC.912.P Investigate and explain the relationships among current, voltage, resistance, and power.

Calculating Electricity

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

Ohm’s Law and Electrical Power

19.2 Potential difference (d) define potential difference and the volt. (e) recall and solve problems using:. f) recall and solve problems using: (d) define.

Jag Mark In terms of electrons, how can an uncharged object become charged?

Electric Circuits Series and Parallel Circuits. Circuit Diagrams An electric circuit is a complete path through which charge can flow Circuit diagrams.

Electric Current and Ohms Law. Electric Current The continuous flow of electric charge –The two types of current are direct current (DC) and alternating.

Electrical Power & Energy Chapter 7-3. Electrical Power F Power is the rate at which work is done F Electrical energy is easily converted into other forms.

Electric Power. Answer Me!!! How is the brightness of a light bulb measured? What do you think is the significance of this?

Electrical Power and Energy. Electrical Power We briefly discussed power (P = W/T), where P = power, W = Work, and T = Time – Power was defined as the.

Electric Power. Complete the table Power (watt) Resistance (ohms) Current (A) Voltage (v) Kettle Dryer (red) Dryer (white) Filter.

Physical Science Mr. Barry. Series circuits have one loop through which current can flow.

Circuit Electricity May 30, 2012 Chapter 22. Terms  Current: Flow of charge  Symbolized by “ I ”  Units = Coulombs/second = Amperes (A)  Circuit:

Parallel Circuit A parallel circuit is one that has two or more paths for the electricity to flow – similar to a fork in a river A parallel circuit is.

Current- the movement of charge. Symbol is I, unit is the Ampere (A) I = q/t 1 A = 1 C/s Conventional current- from the positive terminal to the negative.

Electric Current. Electric Current (I) The net movement of electric charges in a single direction ▫Unit - amperes  Symbol – A  Measurement instrument.

Electricity and Circuit. Types of Electricity Static Electricity – no motion of free charges Current Electricity – motion of free charges – Direct Current.

Electrical Circuits Chapter 20 Section Three. Science Journal Entry #42 Expound upon Ohm’s Law and its relationship to current, resistance, and voltage.

 As you should have observed from the lab experiment you performed yesterday, there is an inverse relationship between the current and the resistance.

Measuring Energy Input and Output. Power Is the rate at which a device converts energy Unit of power is Watt (W) =which is equal to one joule per second.

Review of V, I, and R Voltage is the amount of energy per charge available to move electrons from one point to another in a circuit, measured in volts.

Ohm’s Law Notes JAN 7. Vocabulary current : how quickly the electrons are flowing through the circuit; units: amperes (A) voltage : the electric potential.

Measuring Electricity. Electric Potential – the electrical energy that an electron possesses. Electric current is a measure of the rate at which the electric.

Power in Electrical Systems Power in Electrical Systems.

Chapter 6.3 Notes Electrical Power. Voltage causes charges to move in circuits. This movement creates work. How fast the charge does work is called Power.

Aim: How do we determine the power in a circuit?

Electrical Systems Series Circuits Parallel Circuits Electrical Power.

Electricity and Circuit

Section 3: Circuits Preview Key Ideas Bellringer What Are Circuits?

Do Now (Homework due right now) How much current does a 30 ohm resistor draw over 90V?

A battery raises the potential energy of a charge by an amount equal to qΔV. ΔV is the potential difference of the battery.

Section 3.3 Measuring Energy Input and Output 1

Ch 35 Electric Circuits Electric Circuits.

Power January 12, 2016.

Section 3.3 Measuring Energy Input and Output 1

Basic Electrical Calculations

Direct and Alternating Current

Modified by Mr. Wanninkhof

Section 3.3 Measuring Energy Input and Output 1

Power and Energy.

Goals To calculate resistance using Ohm’s Law

Resistors and Ohm’s Law Experiment No

Electricity Chapter 19.

Equipment This lesson has a small focus on a new equation, other than that it is a small recap and equation practice. Calculators A r.

Ohm’s Law Practice Problem Set Name: ___________________________

Electric Power.

Announcement Ohm’s law video is due at midnight Makeup lab today

Series and Parallel Circuits

Chapters 18 & 19 What is the definition of electric potential?

Presentation transcript:

May 6, 2009 In our lab yesterday, what device did we use to measure the current? Voltage? What causes circuits to become overloaded?

Goals To calculate resistance using Ohm’s Law To define electrical power and short circuit To calculate electrical power

Lab Work Time (15 min) Questions? You have 15 min to work Anything not finished after that is HOMEWORK!

Q: What is electrical power? Rate at which electrical work is done Also called power rating. Energy associated with electrical charges, whether moving or at rest.

Q: What is electrical power? Symbol for electrical power in an equation is P. Unit: Watt (W) Calculated by multiplying the total current (I) through a circuit by the total voltage (V) across a circuit. Equation:

Equation: P = IV Givens: Work: P = (9.1 A)(120 V) Ans: P = 1092 W When a hair dryer is plugged into a 120 V outlet, it has a 9.1 A current in it. What is the hair dryer’s power rating? Equation: P = IV Givens: I = 9.1 A, V = 120 V, P = ? W Work: P = (9.1 A)(120 V) Ans: P = 1092 W

Equation: I = P/V Givens: Work: I = 320 W/120 V Ans: I = 2.67 A A color TV has a power rating of 320 W. How much current is in the TV when it is connected to a 120 V power outlet? Equation: I = P/V Givens: P = 320 W, V = 120 V, I = ? A Work: I = 320 W/120 V Ans: I = 2.67 A

Equation: V = P/I Givens: Work: V = 590 W/ 5.0 A Ans: V = 118 V The current in the heating element of an electric iron is 5.0 A. If the iron dissipates 590 W of power, what is the voltage across it? Equation: V = P/I Givens: P = 590 W, I = 5.0 A, V =? V Work: V = 590 W/ 5.0 A Ans: V = 118 V

UNITS Reminder You CANNOT use any prefixes in these calculations. (Just like Ohm’s Law) For example: 0.15 kW must be converted to W before using as power in calculations! 56 cA must be converted to A before using as current in calculations 100 mV must be converted to V before using as voltage in calculations!