Power and Energy

Question 1

Power (P) is:

• Formula (Power,energy)
• Units

Answer 1

The amount of energy an object uses in given time

• P=E/Dt
• E=P/Dt
• P=(V)(I)
• Energy: Joules or Wh
• Time: s or h
• (4h)(3600)=14400s
• 14400s/3600=4 h
• J=S=W
• Wh=w*h

Question 2

Magnets contain the elements

Answer 2

• iron
• cobalt
• nickel

Question 3

Magnets become:

objects also become

Answer 3

• attacted to one another
• magnetized from magnet

Question 4

Non-magnetic susbtances

Magnetic substances

Answer 4

1. electrons rotate in opposite direction
2. electrons rotate in same direction

Question 5

1. What are formed when the electrons of a magnet rotate in the same direction?
2. If you place magnets next to each other…
3. What creates a magnetic field in the earth

Answer 5

1. North Pole and South Pole are formed
2. Opposites will attract, same will repel (north always ppinted to south, vise-versa)
3. molten iron, A magnet’s noth pole point to the Earth’s magnetic south pole

Question 6

What is a magnet?

what exists in the vacinity of the bar magnet?

Does a magnetic field have a direction

Basic rule of magnetism:

Answer 6

1. an object that attacrts other objects containing iron,cobalt and nickel
2. Magnetic field
3. Yes
4. Opposites attract, you can magnetize an object if it contains cobalt.nickel and iron