A transformer has an input of 9 volts and an output of 36 volts. If the input is changed to 12 volts, what will the output be?

A transformer has an input of9 V and an output of 36 V. If the input is changed to 12 V, show that the output would be 48 V.

A portable CD player requires 12 volts to operate correctly. A transformer nicely allows the device to be powered from a 120-volt outlet. If the primary has 500 turns, how many turns should the secondary have?

A model electric train requires a low voltage to operate. If the primary coil of its transformer has 400 turns, and the secondary has 40 turns, how many volts will power the train when the primary is connected to a 120-volt household circuit?

List the 16 different relations on the set {0, 1}.

How many of the 16 different relations on {0, 1} contain the pair (0, 1)?

Two identical twins can only be distinguished by the characteristic that one always tells the truth and the other always lies. One twin tells you of a lucky number pair: ‘'When I multiply my first lucky number by 3 and my second lucky number by 6, the addition of the resulting numbers produces a sum of 12. When I add my first lucky number and twice my second lucky number, the sum is 5.” Which twin is talking?

How can a change in the voltage of a transformer's primary coil create a change in the secondary coil's voltage, without the coils touching?

Explain why a strong correlation would be found between weekly sales of firewood and weekly sales of cough drops over a 1-year period.

A model electric train requires 6 V to operate. When it is connected to a 120-V household circuit, a transformer is needed. If the primary coil of the transformer has 360 turns, show that the secondary coil should have 18 turns.

If the number of secondary turns is 10 times the number of primary turns, and the input voltage to the primary is 6 volts, how many volts will be induced in the secondary coil?

A beam of electrons travels from left to right between the poles of a horseshoe magnet. The north pole is on the top, and the south pole is on the bottom. In which direction will the beam be deflected when it passes through the poles of the magnet?

A teacher is repeatedly enlarging a diagram on a photocopier. The function

$$f ( x ) = 3 ( 1.25 ) ^ { x }$$

represents the length of the diagram, in centimeters, after x enlargements. What is the length after 5 enlargements? Round to the nearest centimeter.

A transformer is connected to a 9-volt battery. A student tries to use this setup to double the voltage for an experiment. However, the output voltage is zero. Explain why.