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Science 9 Ms. Dureauft 17. Determine the electrical consumption of a stove that has a consumption rating of 1.2 kW and is used for 14 hours. 18. Determine the electrical consumption of a TV that uses 0.3 kW and it was used for 30 hours in one week. 19. Calculate the cost of using a vacuum for 3 hou...

Science 9 Ms. Dureauft 17. Determine the electrical consumption of a stove that has a consumption rating of 1.2 kW and is used for 14 hours. 18. Determine the electrical consumption of a TV that uses 0.3 kW and it was used for 30 hours in one week. 19. Calculate the cost of using a vacuum for 3 hours with a consumption rating of 3.2 kW per hour if the power is $0.097 per kWh. 20. A refrigerator built in 1983 consumed 100 J of energy every hour. The motor that keeps the fridge cold is not very good and always hot. In total, only about 13 J of energy is used to cool the machine. What is the efficiency of this fridge? | Symbol | Description | | :------------------------------ | :--------------------------------------- | | --- | Connecting lead | | --- | Cell | | --- | Battery of cells | | --- | Resistor | | --- | D.C. Power supply | | --- | Junction of conductors | | --- | Crossing conductors (no connection) | | --- | Filament lamp | | --- | Voltmeter | | --- | Ammeter | | --- | Switch | | --- | Variable resistor | | --- | Microphone | | --- | Loudspeaker | | --- | Light emitting diode (led) | | --- | Fuse | | --- | Earth | | --- | Alternating signal | | --- | Capacitor | | --- | Inductor | | --- | Thermistor | | --- | Light dependant resistor (ldr) | 21. Draw circuit that has 3 lights, a voltmeter, an ammeter, an inductor and a 2-cell battery in series. 22. Draw a circuit that has 3 lights, each with a switch in a parallel circuit with a 2-celled battery.