Study for IB Mock Test on 18-19

Do all of section A, and 2 out of 3 from section B

*18:35 - means chapter 18 problem 25, 18.8 means read the section 18-8 in the book

A:- A graph of I vs V for a light bulb

Explain Ohm's Law in terms of electric field and force.

Explain the predictions of a graph of something that obeys Ohm's law, and one that does not

Interpret the graph as being ohmic or not, citing evidence (Read section 18-3, study figure 18-9 at the bottom of p. 498)

6:14

Light Bulb - Resistance and Diff Resistance

http://en.wikipedia.org/wiki/Electrical_resistance_and_conductance

Relate resistance and resistivity proportionally.

Explain what happens to resistivity as temperature changes: (Read section 18-4, esp top of page 502 about temperature)

http://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity#Temperature_dependence

Calculate the cross sectional area of the filament from its resistance and its length. (Like problem 18:12, 13, only you have to calculate the resistance from ohm's law first)

B1- Alternating current and RMS

Read peak voltage and period from graph.

Calculate RMS voltage and frequency (Like oscilloscope lab),

Explain RMS (Read 18-7),

calculate resistance.

Very like 18:35, 41, 43, 44, 45. ( From the old book) and 18: 43, 45, 47 from the current book

B2 - Heater heating up a cup of water. -

current, charge,

number of electrons,

power, energy,

change in temperature (read 14-3),

explain heat loss (Read 14-6, 7, 8)

Very similar to PQ 18#4, and Ch 18 problem 41 (but 100% efficient)

B3 - Fairly simple network circuit - a cell with internal resistance, connected to two parallel resistors.

voltage,

current,

power,

terminal voltage of a battery.

Easier than Circuit Exercise 3A, Read 19-1, especially study example 19-1, Use Equation 19-1 - has to do with terminal voltage