Current Electricity. Why did the electron cross the road? Or, why do electrons move in the wire when terminals are connected?

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Presentation transcript:

Current Electricity

Why did the electron cross the road? Or, why do electrons move in the wire when terminals are connected?

Electric Circuits Conductor forms closed loop from/to battery Charges lose PE

Potential Difference (voltage) Change in PE as charge moves in circuit Variable - V Unit – volt

Current Rate charges move Variable - I Unit – Amp (A)

Resistance Caused by internal friction Variable – R Unit - 

Example 60 W bulb 100 W bulb Which has more resistance?

Which wire has greater resistance? Longer vs. shorter Thicker vs. thinner

Vocabulary Review Potential difference Current Resistance

Circuit Diagram Standard way to draw circuits

Battery

Resistor

Bulb

Switch

In your notes… Draw a series circuit with a resistor, a light bulb, and a switch

In your notes… Draw a parallel circuit with two branches (one bulb in each) and a switch

Series Circuits One path for current flow

Parallel Circuits Multiple paths for current flow

Ohm’s Law V = I R

1/14/15 Review Ohm’s law problems Power quick notes and problems Magnet lab

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