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Electric Current -

Electric Current -. Around 150,000 cars cross the Brooklyn Bridge each day. How many cars cross each second?. Q: An ammeter detects 3C of charge passing through it in 30s, what is the current flowing?. Conditions for current to flow…. Simple Circuit Construction.

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Electric Current -

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  1. Electric Current - Around 150,000 cars cross the Brooklyn Bridge each day. How many cars cross each second? Q: An ammeter detects 3C of charge passing through it in 30s, what is the current flowing? Conditions for current to flow…

  2. Simple Circuit Construction Q: What happens to the brightness of the light bulb when the voltage is increased? Explain why this happens. Q: Explain how the bulb is able to give off light and heat when current flows. Be as specific as possible.

  3. Did You Pay Attention Quiz… What are two acceptable units for current? What two conditions must be met in order for current to flow? What device is used to measure current? How much time would it take for 5C of charge to flow if the current is 2.5A? If an ammeter reading 4.5x10-3C/s flows for .5s, how much charge in Coulombs has passed through the ammeter? How many electrons has been through the ammeter?

  4. Ohm’sLaw - Resistance- Record the current running through the ammeter for the following voltages.. Voltage vs Current Voltage(V) Current (A) Resistor-

  5. DID YOU READ QUIZ? 6. Electric circuits are about not 7. How would you describe the motion of an electron as it travels through a wire?

  6. What is the Resistance ?

  7. Working with Ohm’s Law… What is the current flowing through a resistor if 100C passes through it in 10s? If the current flows through a 6Ω resistor, what is the potential difference across it? What current would flow if the resistance was 12Ω, and 24Ω? Draw the circuit diagram including the source of potential, resistor, ammeter, voltmeter and switch. d) Sketch the plot for the graph of Current vs Resistance. Current (A) Resistance (Ω)

  8. Resistance in a Conducting Wire.. Factors affecting Resistance… Resistivity- A 30m length of copper wire has a cross sectional area of 1.256x10-5m2. What is the resistance in the wire? A 3cm tungsten bulb filament has a resistance of 2.1x10-3Ω.. a) What is the cross sectional area of the filament? What happens to Resistance if… a) 2L b) 1/2Area c) 2r Incandescent Bulb

  9. A power saw draws 15 Amperes of current when plugged into a 120V outlet… What is the resistance of the saw? If the saw runs for 10 seconds, how many Coulombs of charge flow through the saw? If the power cord for the saw has a diameter of 2mm, what is the cross sectional area of the copper wire? If the resistance of the power cord is .01Ω, how long is the cord?

  10. Electric Energy & Power… An electric toaster is plugged into a 120V outlet and draws 10A of current… a) What is the power output of the toaster? b) How much heat is generated in 5min? c) What is the resistance of the toaster? d) How many electrons pass through the toaster each second?

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