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level: Topic 1 4: Power

Questions and Answers List

Question	Answer
What is power?	The rate at which energy is transferred
1kW=______W	1000W
1mW=______W	1000000W
What is the equation for power?	P = E/t
What is time measured in?	seconds
What is energy transferred or work done measured in?	joules
What is specific heat capacity equation, putting heat capacity as the subject?	c = ΔE/ mΔθ
What equipments do you need for investigating specific heat capacity?	Thermometer, immersion heater, cylinder made from insulating material and joulemeter to main energy supply
What does a joulemeter do?	It is an electronic device used to measure the energy transfer by electricity in a circuit
What is power measured in?	Joules
What does a Wattmeter do?	It is an electronic device used to measure watts
What should you do for the specific heat capacity required practical activity if you do not have access to a joulemeter or wattmeter	Connect an ammeter in in series with the heater and voltmeter in parallel
What does an ammeter do?	Measures current in amps
What does a voltmeter do?	Measures potential difference
What is an equation for power if you do not know the work done or energy transferred?	P=IV
What is the equation of energy transferred?	E = Pt
What is Δθ?	Change in temperature
What is ΔE?	Change in thermal energy
What is m?	Mass
What is c?	Specific heat capacity (J/ Kg°c)
What is E?	Energy transferred
What is t?	time
What is P?	Power
What is W?	Work done