pre lab 5
A "2D" Maglite flashlight runs on 3.0V. What is the current through the bulb if resistance is 15 Ω ?
0.20 amps
Incandescent light bulbs have a very thin filament that glows when hot. Thin filaments have very ________ resistance.
high
The 12V battery in your car operates a 25 amp car stereo. What is the resistance of this stereo system?
0.48 ohm
How many volts must an iPod charger provide to charge an iPOD using .85 Amps at 35 Ω?
29.75 v
As resistance increases, current __________________.
decreases
As wire area (cm2) increases, the resistance (Ω) __________________
decreases
As voltage increases, current _________________.
increases
As wire length (cm) increases, the resistance (Ω) _________________
increases
As wire resistivity (Ωcm) increases, the resistance (Ω) _______________
increases
You need to buy a long extension cord to power a stereo at your spring break BBQ. You need 200feet. You have a 50 ft cord that will work. You rationalize that four such 50 ft cords will do the job. Is this a good idea? Why or Why not?
no
