Kkk

Which of the devices is used to measure the current through a load

How much energy does a hairdryer use if it draws 1.4 amps of current and on for 4 min

5.6j

336j

672j

40320j

The following items are connected in a circut. In which one would you find a voltage loss

Battery

Connceting wires

Resistors

Ammeter

To get a conductor to turn into a superconductor you must

ϻ�decrease voltage

ϻ�decrease temperature

ϻ�increase voltage

ϻ�increase resistance

Which is method of charging an object involves grounding the object?

ϻ�friction

ϻ�reduction

ϻ�conduction

ϻ�induction

Potential difference is measured as which of the following?

ϻ�the change in electrical potential per unit of time

ϻ�the amount of energy per unit of charge

The amount of charge that passes per unit of time

ϻ�the amount of time it takes for IC of charge to pass a point

Milikan's Oil Drop experiment determined that

ϻ�opposite charges attract

ϻ�the electron has a charge of 1.6 x 10-19 C

ϻ�electrical current induces a magnetic field around it

ϻ�the strength of a wire depends on length

Which of the following facts about AC or alternating current is true?

ϻ�it can changes voltages using a transformer

ϻ�it can produce a changing magnetic field

ϻ�it switches with a frequency of 60 Hz

ϻ�all of the above

The Kirchoff law for voltage would explain which of the following?

ϻ�3 different resistors in series all drop by the same potential difference

ϻ�3 different resistors in parallel all drop by the same potential difference

ϻ�3 different resistors in series all have the same current passing through them

ϻ�3 different resistors in parallel all have the same current passing through them

Lenz's law states that a changing magnetic field will induce a current in a conductor, so that which of the following happens?

ϻ�The current will create a circular magnetic field.

ϻ�The current will follow the path of least resistance through the conducto

ϻ�The magnetic field created by the current opposes the change in the external magnetic field.

ϻ�The current in the conductor will flow indefinitely.

Which of the following would best describe a series circuit with 3 light bulbs?

ϻ�a switch can be arranged to turn off one bulb

ϻ�the current from the power source divides into each bulb

ϻ�the voltage drop across each bulb adds to that of the power source

ϻ�they can vary in brightest due to the different currents running through them

Four 100 are resistors placed in parallel would have a total resistance of...

25 R

400 R

100r

1600r

To measure the voltage in a circuit, how should a voltmeter be connected?

In tangent

In parallel

In series

While the circuit is disconnected

Faraday noted that current ran on the right hand side of his iron ring experiment only when ..

DC current was flowing on the left

He opened or closed the switch

The switch was closed

There were the care number of loops

Which term describes a transformer that has more windings is the secondary circuit?

Increasing

Decreasing

Step-down

step-up

. The voltage of a transformer changes from 96 000 V to 240 V from the primary to secondary circuits. If the current in the primary coil is only 50 amps, then describe the number of loops and current in the secondary coil?

400 times more loops with 0.125 amps

400 times fewer loops with 0.125 A

400 times more loops with 20 000 A

400 times fewer loops with 20 000 A

Which of the following is NOT true?

Both poles and charges exert forces on each other

Moving charges generate magnetic fields and vice versa

Poles and charges must come in pairs

The greater the distance between them, the weaker their interaction

The power rating of a light bulb is 100 W. What is the resistance and current running through it if the potential difference across the bulb is 120 V?

ϻ�144 0 & 1.2 A

ϻ�144 R & 0.83 A

ϻ�100 2 & 1.2 A

00 82 & 0.83 A

Which of the following devices most likely requires a transformer in its circuitry in order to operate when plugged in to a standard wall outlet?

Cellphone charger

refrigerator

ϻ�iron

The earth's magnetic field ...

Has a south magnetic pole close to the north geographical pole

As a south magnetic pole close to the north geographical pole

ϻ�protects us from the sun's solar winds

ϻ�all the above

What is the main advantage of electromagnets over permanent magnets?

ϻ�they don't have magnetic fields

ϻ�they can have a single pole

ϻ�they can be turned on & off

ϻ�all the above

A wire is directed so that current measured points into the page. What shape and direction are the magnetic field lines?

ϻ�The field lines form parallel lines and point into the page.

ϻ�The field lines form concentric circles and are oriented clockwise.

ϻ�The field lines form concentric circles and are oriented counterclockwise

ϻ�The field lines form concentric circles and point into the page.

. For the following solenoid, where would you find the North Pole?

ϻ�on the top

ϻ�on the bottom

ϻ�to the left

ϻ�to the right

For the following diagram, the current-carrying wire will experiences a force upwards. Which way does the current flow?

Right

Left

25. In which direction is the force if the current is into the page and the magnetic field North pole is on the right?

ϻ�upward

ϻ�downward

ϻ�right

ϻ�left

Which statement about magnetic field lines is true?

They can cross one another outside of the magnet

They are closer together where the magnetic field is stronger.

They point from south to north outside of a magnet.

D. None of the above

For the following DC motor, in what direction will the loop spin?

The loop will spin counterclockwise.

ϻ�The loop will not spin

ϻ�The loop will spin half way clockwise and then back counterclockwise.

ϻ�The loop will spin clockwise

Ampère performed which of the following experiments involving electricity and magnetism?

ϻ�He placed a conducing wire around a magnet in a pool of mercury.

ϻ�He held a compass close to a wire to determine the direction of the magnetic field created by current.

ϻ�He placed two wires parallel to determine the direction of force between them when current is applied. d.

He experimented with large potential differences to transmit electricity wirelessly

Two wires are carying curent in the same direction. Which way is the force on the right wire? d. Ur b.

Down

Left

Right

An electric induction stove top works because a current carrying coil

Produces a changing magnetic fields that induces a current in the pot heats up transferring the heat to the pot

Heats up transferring the heat to the pot

Is grounded and causes the pot to gain a change

Generates a magnetic field in the pot which is attracted to the coil

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