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Short Circuit Voltage Current Power 100 100 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500 500 500 500

False: Electric Potential “electric potential energy per charge.” True or False? Electric Potential is also known as “electric potential energy.” False: Electric Potential is also known as “electric potential energy per charge.” Row 1, Col 1

If 0.25 Coulombs of charge flow through a wire in 4 seconds, then the current would be… 0.0625 Amps: I = C/t = 0.25 Coulombs/4 seconds =0.0625 A 1,2

…Power is defined as the in a certain amount of time. Define Electric Power: …Power is defined as the amount of energy being produced or consumed in a certain amount of time. 1,3

What is the “job” of a Resistor in a circuit? The resistor resists the flow of charge. The resistor can change the amount of current in a circuit. A large resistor with a lot of resistance can reduce the current. 2,1

Which has a greater amount of voltage… AAA size battery or a D size battery? They are both the same. Both have 1.5 Volts. The AAA battery has a smaller amount of Potential Energy AND a smaller amount of charge, but the ratio of PE to Charge is the same for both batteries having equal volts 2,1

Describe how you would use the multimeter to to measure current. You need to make sure there is only One loop for all the current to flow through. This is different than Measuring voltage. When measuring Voltage, one simply touches the Multimeter’s leads to either side of The device being measured. 2,2

What is the current in a 50 W light bulb connected to a 120 V outlet? 0.42 Amps! I = P/V I = 50 W / 120 V I = 0.41667 A or 0.42 A 2,3

If you have a circuit with a 6 Volt battery, and a resistor so that the current is 0.25 Amps, then what is the resistance of the resistor? 24 ohms R = V/I R= 6 V / 0.25 A R = 24 Ω 2,4

If a circuit consists of a 12 Ω resistor and has a current of 1 If a circuit consists of a 12 Ω resistor and has a current of 1.5 Amps, then what is the voltage of the battery? 18 Volts ! V = I R V = (1.5 A) (12 Ω) V = 18 V 3,1

0.75 Amps of Current! I = V/R I = 15 V / 20Ω I = 0.75 A If a circuit contains a 20 Ω resistor and is hooked up to a 15 Volt battery, then the amount of charge flowing is… 0.75 Amps of Current! I = V/R I = 15 V / 20Ω I = 0.75 A 3,2

Kilowatts are a measurement of ______________, and Kilowatt•hours are a measurement of _____________. Power Energy 3,3

The 200Ω resistor connected to the 18V battery has more Which circuit has more current flowing through it… A 20,000 Ω resistor hooked up to a 9V battery or a 200 Ω resistor hooked up to a 18V battery? The 200Ω resistor connected to the 18V battery has more Current flowing through it! 3,4

10 Volts V = PE / C V = 30 J / 3 Coulombs V = 10 V A battery does 30 Joules of work on 3 coulombs of charge. What voltage does it supply? 10 Volts V = PE / C V = 30 J / 3 Coulombs V = 10 V 4,1

How much current is in a circuit that uses 120V and has a 24W light bulb acting as a resistor? I = P / V I = 24W / 120V I = 0.2 A 4,2

Which bulb will be brighter, a 12Ω resistor hooked up to a 6V battery, or a 150Ω resistor hooked up to a 6V battery? The 12 Ω resistor connected to the 6V battery! Less resistance ⇨More Current ⇨More Power ⇨ Brighter light bulb! 4,3

Less resistance ⇨More Current ⇨More Power Two light bulbs designed for 110V use are rated at 25W and 50W. Which light bulb has the smaller amount of filament resistance and why? The 50 Watt light bulb has the smaller amount of resistance, and is therefore brighter. Less resistance ⇨More Current ⇨More Power ⇨ Brighter light bulb! 4,4

A toaster oven has a resistance of 15Ω and is plugged into a 120V voltage source. What is the amount of power used by this toaster? P = IV **Need I** I = V/R I = 120V / 15Ω I = 8 A P = IV = (8A)(120V) = 960 Watts! 5,1

I = P/V I = 2500W / 110 V I = 22.7 A R = V/I R = 110V / 22.7 A What is the amount of current and resistance of a vacuum cleaner that uses 2500 Watts and is operating with 110V? I = P/V I = 2500W / 110 V I = 22.7 A R = V/I R = 110V / 22.7 A R = 4.84 Ω 5,2

How much energy does an electrical device use that is drawing 0 How much energy does an electrical device use that is drawing 0.25 A of current and operates with 6V for a time of 3 hours? Energy = P • t And P = I • V So… Energy = (I • V) • t Energy = (0.25A •6V) •10800sec Energy = 16,200 J (Or Energy = 0.0045 kW•h) 5,3

Describe how to measure voltage across a light bulb in a circuit. Each multimeter lead is placed on each side of The light bulb. The multimeter is set on DC Volts, at the 20. The Red lead is plugged into The “V” port and the Black lead is plugged into The “COM” port. This is different than measuring current! 5,4