Electrical Power and Time Calculations

What is the unit of measurement for power?

• Joules
• Watts
• Voltage
• Calories

The equation for POWER is:

• power = mass x time

• power = Energy / time

• power = time / water

• power = Energy x time

How much energy does this appliance transfer per second?

• 240 V
• 50 Hz
• 150 W
• N533

A microwave has a power rating of 1550 W. How much energy does it transfer per second?

• 1.550 Joules
• 15.50 Joules
• 155.0 Joules
• 1550 Joules

Tags

NGSS.HS-PS3-2

Which appliance transfers the most energy per second? 

• Clock
• Lamp
• Desktop Computer
• Iron

Tags

NGSS.HS-PS3-4

A lamp has a 120 W power rating. It is left on for 30 seconds. How much energy did it use?

• 3600 J

• 36 J

• 450 J

• nah

Tags

NGSS.HS-PS3-1

A kettle transfers 1000J of energy every 2 seconds. Calculate its power.

• 2000 Watts

• 1000 Watts

• 500 Watts

• cannot be determined

Tags

NGSS.HS-PS3-4

A microwave used 75 kJ of energy to heat up a lasagna. If the microwave was 750 W how long did this take?

• 10 minutes

• 100 seconds

• 5000 hours

• i don't eat lasagna I'm not Garfield

Tags

NGSS.HS-PS3-1