Download ER WS 4 Making Quantitative Predictions for Series

School of the Future
Physics II
Name:
Date:
ER WS 4: Making Quantitative Predictions for Circuits
including Electric Power
School of the Future
Physics II
Name:
Date:
ER WS 4: Making Quantitative Predictions for Circuits
including Electric Power
Complete the following questions on a separate sheet of paper.
Complete the following questions on a separate sheet of paper.
Level I
1. A current of 0.20A flows through a resistor of 50Ω. What is:
a. The potential difference across the resistor?
b. The power rating of the resistor?
Level I
1. A current of 0.20A flows through a resistor of 50Ω. What is:
a. The potential difference across the resistor?
b. The power rating of the resistor?
2. A speaker has a power rating of 8W.
a. How much “sound energy” is produced over 1 minute?
b. How much current flows through the speaker when connected to an Arduino (5V
power source)?
c. What is the resistance of the speaker?
2. A speaker has a power rating of 8W.
a. How much “sound energy” is produced over 1 minute?
b. How much current flows through the speaker when connected to an Arduino (5V
power source)?
c. What is the resistance of the speaker?
Level II
3. An LED has a power rating of 10W. It is connected to an Arduino (5V) with no additional
resistor.
a. What is the current through the LED?
b. How much charge flows through the LED in 3 minutes?
Level II
3. An LED has a power rating of 10W. It is connected to an Arduino (5V) with no additional
resistor.
a. What is the current through the LED?
b. How much charge flows through the LED in 3 minutes?
4. A toaster, when left on for 5 minutes, produces 15,000J of heat when connected to a 20V
power source.
a. What is the power rating of the toaster?
b. What is the resistance of the toaster?
c. How much current flows through the toaster?
4. A toaster, when left on for 5 minutes, produces 15,000J of heat when connected to a 20V
power source.
a. What is the power rating of the toaster?
b. What is the resistance of the toaster?
c. How much current flows through the toaster?
Level III
Level III
5. One 20Ω motor and one 40Ω motor are connected in series to a set of four 8V batteries.
What is the power rating of each motor?
5. One 20Ω motor and one 40Ω motor are connected in series to a set of four 8V batteries.
What is the power rating of each motor?
6. A light bulb has a power rating of 15W when connected to a 120V power source. Its
filament is 0.8cm long and has a resistivity 2.65x10-8 Ω*m. What is the diameter of the
filament?
6. A light bulb has a power rating of 15W when connected to a 120V power source. Its
filament is 0.8cm long and has a resistivity 2.65x10-8 Ω*m. What is the diameter of the
filament?
Level IV
7. Two light bulbs of resistances RA and RB are connected in series to an Arduino (5V). What
is the power rating of each bulb? Your answer can be in terms of RA and RB.
Level IV
7. Two light bulbs of resistances RA and RB are connected in series to an Arduino (5V). What
is the power rating of each bulb? Your answer can be in terms of RA and RB.
NEVER DOUBT THAT A SMALL GROUP OF COMMITTED INDIVIDUALS CAN CHANGE THE WORLD, INDEED IT IS THE ONLY THING THAT EVER HAS. MEAD
NEVER DOUBT THAT A SMALL GROUP OF COMMITTED INDIVIDUALS CAN CHANGE THE WORLD, INDEED IT IS THE ONLY THING THAT EVER HAS. MEAD