CANVAS 8th Grade Unit 5 Electricity and Magnetism

A circuit is arranged to determine the resistance of a resistor labeled R. The meter indicates readings of 2.0 A and 3.0 V. What is the resistance value of resistor R?

• 1.5 Ω

• 0.67 Ω

• 6.0 Ω

• 5.0 Ω

Calculate the current in a wire when 550 C of charge is transferred in 3.0 minutes.

• 3.06 A

• 0.30 A

• 9.17 A

• 1.02 A

A 15 A fuse has been used mistakenly in place of the 5.0 A fuse that should be fitted for a lamp in good condition. What happens when the lamp is switched on?

• The lamp works normally.

• The lamp draw too much current.

• The fuse blows.

• The lamp does not light and the fuse does not blow.

Tags

NGSS.MS-ETS1-1

The diagram below illustrates the electric field lines within an isolated region of space for two small charged spheres, Y and Z. Which of the following statements is true?

• The strength of the electric fiels is teh same everywhere.

• The electric field is strongest midway between Y and Z.

• A small negatively charges object palced at the red X would tend to move to the right.

• The charge on Y is negative and the charge on Z is positive.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Which arrangements of resistors in the pictures have the same resistance between the terminals?

• 1 and 4

• 1 and 2

• 3 and 4

• 2 and 3

The current in a 240 V electric heater is 5.0 A. Calculate the power of the electric heater.

• 1200 W

• 48 W

• 0.021 W

• 650 W

Tags

NGSS.HS-PS3-4

Which of the following statements about permanent magnets is NOT true?

• When a permanent magnet is cut in half, one piece will be a north pole and one piece will be a south pole.

• The direction of a magnetic field is indicated by the north pole of a compass.

• All permanent magnets are surrounded by a magnetic field.

• The north pole of a permanent magnet is attracted to a south pole.

Tags

NGSS.MS-PS2-3

The magnetic field of a solenoid can be increased by

• increasing the number of turns

• decreasing the current

• using a thinner wire

• shortening the solenoid

Tags

NGSS.HS-PS2-5

Which of the following will increase the strength of an electromagnet?

• All of the above

• putting an iron core inside the coil to make an electromagnet.

• increasing the current.

• adding more loops.

Tags

NGSS.HS-PS2-5

A transformer is used to convert 240 V AC power to 12 V AC power for a racing model car set. There are 50 turns on the secondary coil. Calculate how many turns the primary coil has.

• 1000

• 58

• 1.4 x 10^5

• 750

Tags

NGSS.HS-PS2-5