Factor Label 2 step problems

Factor Label 2 step problems

Let's get familiar with conversion factors

Multiple Choice

What unit can be converted to kg coal using only one conversaion factor?

• kWh electricity

• BTU

• kWh heat

• ft^3 natural gas

Multiple Choice

Which can be converted to BTU using one conversion facotr

• kWh electric and kWh heat

• kg coal and kwh electric

• ft^3 natural gas and kWh heat

• only kWh heat

Multiple Choice

Problem: You have created 400kWh of electricity using natural gas and want to know how many BTUs were created.

You see only one conversion that involves kWh of natural gas. What is it and how will you write it next to the 4000kWh elec?

• 1000BTU / 0.29 kWh heat

• 420 kWh elec / 1000 kWh heat

• 1000 kWh heat/420 kWh elec

Multiple Choice

Problems: You have created 400kWh of electricity using natural gas and want to know how many BTUs were created.

With the conversions from the last slide, you now have the unit kWh heat on top. How will you write the conversion to BTUs?

• 1000 BTU / 0.29kWh

• 0.29kWh/ 1000 BTU

Multiple Choice

Problems: You have created 400kWh of electricity using natural gas and want to know how many BTUs were created.

Which is the final solution:

A) 400kWh elec x (1000kWh heat/420kWh elec) x (1000 BTU/ .29kWh heat)

B) 400kWh elec x (1000kWh heat/420kWh elec) x (.29kWh heat/1000 BTU)

C) 400kWh elec x (420kWh elec/1000Wh heat) x (1000 BTU/ .29kWh heat)

• A

• B

• C

New Problem

Multiple Choice

Problem: You made 5,000 kWh of heat from burning coal. How many kg did you burn?

What units can be calculated from kWh heat using one conversion factor?

• BTU and kg coal

• kg and kWh electric

• BTU and kWh electric

Multiple Choice

Problem: You made 5,000 kWh of heat from burning coal. How many kg did you burn?

Which of the two possible units you just chose (BTU and kWh electric) can then be converted to kg?

• BTU

• kWh electric

So in order to get to kg you need to get to BTU and to get to BTU to need to get to kwH heat

Multiple Choice

Problem: You made 5,000 kWh of heat from burning coal. How many kg did you burn?

Write out a solution and show Ms. Flarend. She will then tell you what lette rto pick.

• a

• b

• c

• d

• e

Multiple Choice

Problem: You create 7600 BTUs of heat from burning natural gas. How many kWh electricity can be made?

You could convert BTUs to ft^3 of natural gas. Will that units lead to kWh electricity?

• yes, we have a single conversion that goes from ft^3 of natural gas to kWh electric

• no there is not a single conversion that goes from ft^3 of natural gas to kWh electric

Multiple Choice

Problem: You create 7600 BTUs of heat from burning natural gas. How many kWh electricity can be made?

What will be the first conversion factor you will use to cancel out the BTUs?

• 1000BTUs / 0.29 kWh heat

• 1ft^3 natural gas / 1020 BTUs

• 0.29 kWh heat / 1000BTUs

• 1020 BTUs / 1 ft^3 natural gas

Multiple Choice

Problem: You create 7600 BTUs of heat from burning natural gas. How many kWh electricity can be made?

Write out a solution and show Ms. Flarend. She will then tell you what letter to pick.

• a

• b

• c

• d

• e

Multiple Choice

Problem: You create 7600 BTUs of heat from burning natural gas. How many kWh electricity can be made?

After that conversion factor, the BTUs have cancelled out and you have kWh heat on top. What conversion factor would be next to get to kWh electricity?

• 420 kWh elec/ 1000 kWh heat

• 329 kWh elec/ 1000 kWh heat

• 1000 kWh heat / 420 kWh elec

• 1000 kWh heat / 329 kWh elec