power, efficency and cost of electricity

Power is a measure of how much ______ can be done in a set amount of ______.

• Work, Time
• Work, Energy
• Energy, Force
• Force, Work

Work is a measure of the energy needed to apply a force across a _______.

• time
• distance
• gravity
• object

Tags

NGSS.HS-PS2-1

Efficiency is a ______ of what you put in versus what you get out of a system.

• source
• ratio
• multiplication
• addition

An object has a weight of 200 N and is moved 3 meters.  How much work is done?

• 66.7 J
• 600 J
• 203 J
• 0.015 J

Flash is the most powerful hero because...

• He can do the most in the least amount of time.
• He can do the most.
• He can move the fastest.
• He isn't.

Efficiency is....

• measured in Joules.
• a percentage.
• measured in Watts.
• measured in Newtons.

Tags

NGSS.HS-PS3-3

NGSS.HS-PS3-4

For there to be work, there must always be distance.

• True
• False

Power does not depend on...

• strength
• work
• time
• any of these

The unit for Electrical Power is

• hour

• ampere

• watt

• Volt

The S.I unit for Electrical Energy is

• kwh

• KWj

• kWh

• KWJ