Which is cheapest to use a 1330 watt microwave convection oven for 1 hour or 3.2 kw gas hour?

To determine which is cheaper to use, we need to convert the power consumption of the microwave convection oven and the gas hob to a common unit, which is kilowatt-hours (kWh).

Microwave convection oven:

Power consumption = 1330 watts = 1.33 kilowatts (kW)

Time = 1 hour

Energy consumption = Power x Time

= 1.33 kW * 1 hour

= 1.33 kWh

Gas hob:

Power consumption = 3.2 kW

Time = 1 hour

Energy consumption = Power x Time

= 3.2 kW * 1 hour

= 3.2 kWh

Now, let's assume the cost of electricity is $0.1 per kWh and the cost of gas is $0.5 per kWh.

Cost of using microwave convection oven:

Cost = Energy consumption x Cost per kWh

= 1.33 kWh * $0.1

= $0.133

Cost of using gas hob:

Cost = Energy consumption x Cost per kWh

= 3.2 kWh * $0.5

= $1.6

Comparing the costs, we can see that using the microwave convection oven for 1 hour is cheaper than using the gas hob for 1 hour.

Therefore, the cheapest option is to use the 1330-watt microwave convection oven for 1 hour.