Current Basics Notes - Show Me The Physics

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Current Basics

In the instructor's analogy,
what does the water current represent?

Show Me The Physics
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D) Conditions for passing current

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Voltage, Resistance and Current

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1) complete circuit

2) potential difference (voltage) supplied by some source

ex. Battery, generator

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3) conductor (wires)

I. Important Circuit Terms

A) Current (I) - measure of charge flow

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Electric_Current.mov

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I = q/t

q = charge (C)

t = time (sec)

= (C)/(sec) UNIT

OR Amperes

Ex) If 10. coulombs of charge are transferred through an electric circuit in 5.0 seconds, then the current in the circuit is

I = 10. C/5.0 sec

I = 2.0 Amps

1 Coulomb = 6.25 x 10¹⁸ electrons

(A bundle of Electrons)

p. 1 Reference

I =	(#e-)(1.6 x 10^-19 C)
	t

Ex) A wire carries a current of 2.0 amperes.

How many electrons pass a given point in this wire in 1.0 sec?

Ex) A wire carries a current of 2.0 amperes. How many electrons pass a given point in this wire in 1.0 sec?

I =	(#e-)(1.6 x 10^-19C)
	t

2.0 A =	(#e-)(1.6 x 10^-19 C)
	1.0 sec

Cross Multiply And Divide

2.0 A	= (#e-)
(1.6 x 10^-19 C)

#e^- = 1.3 x 10¹⁹

(2 sig. figs.)

AP Physics

Giancoli - p. 515) 8

V = IR

9.0 V = I[1.6 ohm]

I = 5.6 Amps

I = q/t

q = It

q = 5.6A(60 sec)

= 330 C

divide by 1.6 x 10^-19C

= 2.1 x 10²¹ elect.

Ohm's Law