Chapter 12 The Boy Who Harnessed the Wind

What is the main idea of chapter 12?

• There were new uses for the windmill William was discovering like charging phones.

• The windmill was limited on the power it could generate because it only operated using AC current.

• The windmill was limited on the power it could generate because it only operated using DC current.

• William begins to use the windmill to pump water.

What does the word engrossed mean in this sentence on page 215? " My father and sisters were engrossed in a news program on radio one."

• Engrossed means upset about something you hear.

• Engrossed means involved in what you are doing.

• Engrossed means excited about what you are doing.

• Engrossed means not caring about what you are listening to.

How were the guys in the market charging the phones on the sidewalk?

• They had a very powerful battery they hooked the phones up to.

• They had a generator they used they plugged the phones into.

• They ran an electric cord from the shopkeeper out to the sidewalk.

• They had a power station with a built in electric system from ESCOM.

How did William get the idea he could charge cell phones with his windmill?

• People in the town kept asking him if he could charge their phones since the ESCOM power kept going out.

• He saw the people lined up in long lines at the trading center and got the idea that he could do the same thing.

• He needed to charge his phone and he did not have the money to pay for his to get charged at the trading center.

• His cousin Ruth questioned why he coud not charge her phone with the windmill since it created electricity.

Why could William's windmill not charge Ruth's phone?

• The cell phone required 1000 volts the dynamo only generated 12 volts of power.

• The cell phone required 400 volts the dynamo only generated 5 volts of power.

• The cell phone required 500 volts the dynamo only generated 12 volts of power

• The cell phone required 220 volts the dynamo only generated 12 volts of power.

How did William describe in a simile how how transformers step up electricity from the power station to your home?

• It's like giving your electricity some coffee and doughnuts to keep it going.

• It's like giving your electricity some Poweraide to keep it going.

• It's like giving your electricity some Gatorade to keep it going.

• It's like giving your electricity a Monster drink to keep it going.

Describe mutual induction in a step-up transformer?

• An alternating current flows back and forth from the the bottom coil to the secondary coil

• An alternating current flows back and forth from the the secondary coil to the primary coil

• An alternating current flows back and forth from the the primary coil to the secondary coil

• A direct current flows back and forth from the the primary coil to the secondary coil

What is the purpose for using mutual induction in transformers?

• Voltage decreases

• Voltage skips around making it safer

• Voltage continues on a direct current.

• Voltage increases

How did William create his own step-up transformer?

• He cut some sheet iron into an E shape then wired a coil with 20 wire turns and a second coil with 200 times then he attached the dynamo to the primary coil .

• He cut some sheet iron into an E shape then wired a coil with 100 wire turns and a second coil with 200 times then he attached the car battery to the primary coil .

• He cut some sheet iron into an E shape then wired a coil with 200 wire turns and a second coil with 2000 times then he attached the dynamo to the primary coil .

• He cut some sheet iron into an E shape then wired a coil with 200 wire turns and a second coil with 2000 times then he attached the car battery to the primary coil .

Why could William not use the dynamo to charge the dead car battery?

• The car battery uses AC power the Dynamo uses DC power.

• The car battery uses DC power the Dynamo uses AC power.

• The car battery uses too much power for the Dynamo.

• The car battery uses less power than the Dynamo.