Calculating Electrical Energy

What unit is the electrical energy consumption of appliances usually measured in?

• watts

• joules

• kilo-watt hours

• amperes

Calculate the electrical energy consumption of a 10 kW electric stove that has been used to bake a cake for 1 hour.

• 1 kWh

• 10 kWh

• 100 kWh

• 1000 kWh

Tags

NGSS.HS-PS3-1

What kind of circuit is this?

• series

• parallel

• simple

• open

What type of circuit is this?

• series

• simple

• open

• parallel

A toaster, rated 1500 W 240 V, is switched on for 15 minutes. Calculate the energy used.

• 3600 J

• 22 500 J

• 216 000 J

• 1 350 000 J

Tags

NGSS.HS-PS3-1

An air-con, rated 1.8 kW 240 V, is switched on for 10 minutes. Calculate the energy used.

• 1 080 000 J

• 144 000 J

• 2400 J

• 18 J

Tags

NGSS.HS-PS3-1

A 5kW electric cooker is used for 55 minutes to cook. Calculate the cost of electrical energy used if the rate per unit is 50 sen.

• RM 0.23

• RM 230

• RM 2.30

• RM275

Tags

NGSS.HS-PS3-1

An electric heater is rated 230V, 10 A. Calculate the power of the electric heater in kW.

• 2300

• 23

• 2.3

• 0.23