__What is on the test__?

Chapter 10

- Lighting a Bulb...how do you use one cell, one wire, and one bulb to create light? How about with two wires? p323

- Circuit Symbols...know the symbol for conducting wire, cell, battery, light bulb, resistor, switch ammeter and voltmeter. Be able to draw a circuit diagram using these symbols.
- Examples:

- Be able to describe what current, charge, Potential Difference (voltage), and resistance are. Be able to use formula to solve for each of these things and to understand the relationships between them.
- I=
__Q__current =__charge moving past a point__Amp =__coulomb__ - t time second

- V=
__E__Potential difference =__Energy__Volt =__Joules___ - Q Charge Coulomb

- R=
__V__resistance =__potential difference__Ohm =__Volts__ - I current Amps
- D=
__M__density =__mass____grams__=__grams__ - V
volume
cm
^{2 }cm^{2 }

- Study your labs 10-A Measuring Current, p326-327, 10-B Energy Around a Simple Circuit p. 334-335, and 10-C Potential Difference and Current for a Resistor p. 340-341...for 10-C look at both labs...using spool resistors (resistance coils) and using ceramic resistors.

- Be able to describe how resistance is
affected by the length of conducting wire, the width of the wire, the material
that the wire is made from, and the temperature of the wire.
Longer wire yields greater resistance, shorter wire yields less resistance

Thinner wire yields greater resistance, thicker wire yields less resistance

The resistance changes according to the material that the conducting wire is made from...copper offers less resistance than nickel-silver wire. Copper is a better conductor of current electricity.

Temperature of wire affects resistance. Hot conducting wire offers greater resistance; cool conducting wire offers less resistance.

Chapter 11

Dimming the Lights...series vs parallel circuits.

Series Circuits...one pathway for all electrons to flow on; As resistance increases the current decreases; all lights on the circuit are the same brightness as each other

Parallel circuit...more than one pathway for the electrons to
flow in will increase the current in the __common part__ of the pathway, each
pathway will have current dependent upon the resistance in that pathway.

How Bright Are You? questions which look at how bright bulbs are in series and parallel circuits...know how to determine standard, less than standard and more than standard brightness.