1. A Random Gathering of Ideas
The Electroscope
Coulomb’s Law
Multimeters
Circuit Lab

2. The Electroscope LIKES REPEL.
The ‘leaves’ or the ‘needle’ of the electroscope move when they gain a charge.
LIKES REPEL.

6. Coulomb’s Law
The strength of the electric force increases with increasing electric charges and decreases with increasing distance For the following compare the two scenarios. Indicate which has more strength of electric force. Electric Charges Distance 1) 1) 2) 2) - - - + + - + + - - - - - - + + + + + + - + + - - - - - - + + - + +

8. The Multimeter There are 3 parts to a multimeter: Display
Selection Knob
Allows you to read different things like current (mA), voltage (V) & resistance (Ω)
Ports
One is COM (or COMMON) and is always connected to the “-” or a circuit
The others are for measuring different things

9. We are using Direct Current (DC) in a circuit
We are using Direct Current (DC) in a circuit. This means that the electrons are flowing in one direction only. Set the multimeter to 200m under DCA. The ‘A’ represents Amperes or CURRENT. 2 represents 2 Amps of current. Or 2000 milliAmps (m).

10. DO NOT CHANGE THE SETTING to be TOO LOW
DO NOT CHANGE THE SETTING to be TOO LOW. THIS WILL BLOW A FUSE IN THE MULTIMETER and BREAK IT. DO NOT DIRECTLY TEST THE BATTERY WITHOUT A LOAD! THE SAME WILL HAPPEN!

11. The multimeter needs to be set up in SERIES in the circuit.

13. Circuit Lab