Download presentation

Presentation is loading. Please wait.

Published byIsabella Joyce Modified over 2 years ago

1
April 26/28 Physics

2
Table of Contents #. Date Title-Page – Page Number 29.April 14/15 Electrostatics 30.April 18/19 Electric Field 31.April 20/21 Electrostatics Problems 32.April 22/25 Circuits 33.April 26/28 Measuring Electricity 1

3
Homework #4

4
In: Label each diagram as series or parallel:

5
Objective: To understand Ohms law and measure: Simple Series Parallel circuits Success criteria: Calculate and measure current, voltage and resistance.

6
Amount of charge passing by every second: Current I=ΔQ Δt Measured in Amperes 1 Ampere= 1 Coulomb second

7
If a current of 45.0 mA exists in a metal wire, how much charge goes through in 20 minutes? How many electrons flow past a given cross section of the wire in 10.0 min? Sketch the direction of the current and the direction of the electrons motion.

8
Energy of each charge Electric potential V measured in Volts Energy charge

9
Voltage is like a pinball machine pushing the electrons out of the source into the circuit

10
Resistance to flow of electrons Resistance Measured in Ohms Ω

11
Resistance slows down the flow of electrons –Voltage used up –Light emitted –Heat emitted

12
How do you think the current would change if you increase the resistance in a circuit?

13
How do you think the current would change in a circuit if you increase the voltage into a circuit?

14
Ohms Law Georg Simon Ohm German physicist The relationship between current and voltage 1827

15
Ohms Law V=IR

16
A lightbulb has a resistance of 240 Ω when operating at a voltage of 120 V. What is the current in the bulb?

17
A toaster has a resistance of 10 kΩ. How much current flows through it at a voltage of 120V?

18
What is the resistance of a hair dryer if it runs at 120V with a current of 1 A?

19
What is the current of a lightning bolt that has a voltage of 10 million volts through air with a resistance of 2 KΩ?

20
Lab: Using a Multimeter Purpose: to measure circuits.

21
How to measure resistance voltage and current

22

23

24
Reading a Resistor

25

26
Measuring Voltage -Direct measurement of the push -Connect directly to the battery (or circuit if you want to measure change in voltage)

27
Measuring Resistance -Connect leads to resistor -Outside of a circuit

28
Measuring Current Must be a circuit Circuit must include the meter

29
Out: A hairdryer takes 1 amp of current at 120 V. What is its resistance?

Similar presentations

© 2016 SlidePlayer.com Inc.

All rights reserved.

Ads by Google