Energy Efficiency
Circuits
Prac Skills
Ohms Law
Energy Transformations
100
How much energy is wasted in this light globe?
25 J
100
Series or Parallel?
Series
100
Where do you plug in the wires into a transformer?
AC or DC ?
DC
100
What is the unit of measurement for Voltage?
Volts
100
What term describes the flow of electrons through a circuit?
Current
200
How much electrical energy is supplied to this light bulb?
100 J
200
A circuit that has only one path for electricity to flow is a...
Series circuit
200
What is the unit of measurement for current?
Ampere, Amps
200
What is the electrical force required to cause electrons to flow in a circuit called?
Voltage
200
When you turn on a light bulb, what energy transformation occurs?
A) Chemical → kinetic
B) Electrical → light and heat
C) Kinetic → sound
D) Heat → electrical
B) Electrical → light and heat
300
What is the maximum number of energy efficiency stars an appliance can have?
10
300
Series or Parallel?
Parallel
300
What is the unit of measurement for resistance?
Ohms
300
Calculate resistance when Current is 2 and Voltage is 8.
8 / 2 = 4 Ohms
300
What is resistance?
Opposition to the flow of current in a circuit / slowing the flow of electricity.
400
What is the main benefit of improving energy efficiency in your home?
A) It makes appliances heavier
B) It increases energy use
C) It reduces energy bills
D) It uses more electricity
C) It reduces energy bills
400
A circuit that has more than one path for electricity to flow is a...
Parallel Circuit
400
Name one strategy to mitigate harm when conducting a practical with electricity.
Keep electrical equipment away from water.
Turn off power whenever you change/move items in a circuit.
Ensure all wires and equipment are undamaged before using.
400
Ohms law states that as voltage increases current ___________.
also increases.
400
State the law of conservation of energy.
Energy cannot be created or destroyed, only tranformed or transferred.
500
What does “energy efficiency” mean?
A) Using more energy to do more work
B) Using less energy to do the same task
C) Turning off all electricity
D) Only using renewable energy
B) Using less energy to do the same task
500
What 3 components are needed in a closed circuit to allow electricity to flow and do work?
A power source (transformer), conductor (wire) and load (light bulb etc) in a closed circuit.
500
Name the 5 pieces of equipment shown in the diagram.
Light globe, transformer, switch, ammeter, wires.
500
Ohms law states that as resistance increases, current __________.
decreases.
500
Identify the missing energy transformations occuring in a coal power plant in the following steps:
Coal is burnt (________ --> heat)
Heats water, turning it to steam (heat --> kinetic)
Steam turns a turbine (kinetic --> mechanical)
Generates electricity (mechanical --> ________)
Coal is burnt (chemical --> heat)
Heats water, turning it to steam (heat --> kinetic)
Steam turns a turbine (kinetic --> mechanical)
Generates electricity (mechanical --> electrical)