ib physics 12 mr. jean december 5 th, 2014. the plan: video clip of the day internal resistance in...
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IB Physics 12
Mr. JeanDecember 5th, 2014
The plan: • Video clip of the day• Internal resistance in a battery• The Tesla… if you liked the “WEEBERRR”
just wait…..• More magnetic fun!
Internal Resistance: • Systems do not like to change when in steady state.
• When a battery is not connected it’s at a steady state; however when we start get current to flow we need to push the current down the wire.
• In a closed circuit we see that the wire is connected back to the battery. Thus the current must go back through the battery.
• Therefore because it takes some energy to more the current even a battery has resistance.
Internal Resistance:
Internal Resistance: • E = I (R + r) IB Notation:
• E = EMF• I = Current in the system• R = Resistance in system• r = Resistance in the battery
Internal Resistance:
• http://www.youtube.com/watch?v=IftDnfr5ow0
Unit Analysis for Tesla:• A particle carrying a charge of 1 coulomb and passing through a magnetic
field of 1 tesla at a speed of 1 meter per second perpendicular to said field experiences a force with magnitude 1 newton, according to the Lorentz force law. As an SI derived unit, the tesla can also be expressed as
• Units used:– A = ampere– C = coulomb– kg = kilogram– m = meter– N = newton– s = second– T = tesla– V = volt– Wb = weber
Faraday / Lenz’s Law:• Brightstorm: Faraday Lenz’s Law
– http://www.youtube.com/watch?v=qWu82nJS42I
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