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April 26/28
Physics
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Table of Contents#. Date Title-Page – Page Number29.April 14/15 Electrostatics30.April 18/19 Electric Field31.April 20/21 Electrostatics Problems32.April 22/25 Circuits33.April 26/28 Measuring Electricity
1
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Homework #4
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In:
Label each diagram as series or parallel:
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Objective: To understand Ohm’s
law and measure:• Simple• Series• Parallel circuits
Success criteria:
Calculate and measure current, voltage and resistance.
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Amount of charge passing by every second:
CurrentI=ΔQ Δt
Measured in Amperes1 Ampere= 1 Coulomb
second
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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.
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Energy of each charge
Electric potential
V measured in Volts
Energy
charge
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• Voltage is like a pinball machine pushing the electrons out of the source into the circuit
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Resistance to flow of electrons
Resistance
Measured in Ohms
Ω
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• Resistance slows down the flow of electrons– Voltage used up – Light emitted– Heat emitted
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• How do you think the current would change if you increase the resistance in a circuit?
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• How do you think the current would change in a circuit if you increase the voltage into a circuit?
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Ohm’s Law
Georg Simon Ohm
• German physicist
• The relationship between current and voltage
• 1827
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Ohm’s Law
V=IR
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A lightbulb has a resistance of 240 Ω when operating at a voltage of 120 V. What is the current in the bulb?
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A toaster has a resistance of 10 kΩ. How much current flows through it at a voltage of 120V?
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What is the resistance of a hair dryer if it runs at 120V with a current of 1 A?
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What is the current of a lightning bolt that has a voltage of 10 million volts through air with a resistance of 2 KΩ?
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Lab: Using a Multimeter
Purpose: to measure circuits.
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How to measure resistance voltage and current
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Reading a Resistor
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Measuring Voltage
• -Direct measurement of the push
• -Connect directly to the battery (or circuit if you want to measure change in voltage)
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Measuring Resistance
-Connect leads to resistor
-Outside of a circuit
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Measuring Current
• Must be a circuit
• Circuit must include the meter
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Out:
A hairdryer takes 1 amp of current at 120 V. What is its resistance?