Watts

What is the formula to calculate electrical power?

• potential difference / current

• potential difference / resistance

• potential difference x current

• potential difference x resistance

Tags

NGSS.HS-PS2-5

How much will it cost to run a 60 W lamp for 10 hours?

• $0.05

• $0.18

• $3.00

• $18.00

Tags

NGSS.HS-PS3-1

An electric rice cooker rated 800W, 230V is switched on for 30 minutes. How much electrical energy is used?

• 400kWh

• 3.48kWh

• 0.4kWh

• 104kWh

Tags

NGSS.HS-PS3-1

An electric rice cooker rated 800W, 230V is switched on for 30 minutes. Calculate the cost of energy that is used by the rice cooker if the cost per kWh is 30sen.

• RM12

• RM0.12

• RM1.20

• RM120

Tags

NGSS.HS-PS3-1

Electrical power can be calculated using

• Resistance x Voltage

• Voltage x Current 

• Voltage ÷ Current

 A 120 Vac - 20 A  circuit breaker max power rating

• 240 watts

• 24 watts

• 2400 watts

• 240 volts

Watts is the same as...

• Joules per second

• Voltage per second

• Current per second

You do 90 joules of work in 30 seconds. How much power have you generated?

• 30 watts

• 3 watts

• 120 watts

• 270 watts

Which of the following would produce the most power?

• mass of 10 kilograms lifted 10 meters in 10 seconds 

• mass of 10 kilograms lifted 10 meters in 5 seconds

• mass of 5 kilograms lifted 10 meters in 5 seconds

• mass of 5 kilograms lifted 5 meters in 10 seconds

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?

• 170 W

• 170 A

• 1.7 V

• 1.7 W