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# Preliminary Physics

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## 2 | Electrical energy in the home

### 4: The amount of power is related to the rate at which energy is transformed

#### Lesson 1 | Power, current and voltage

• Explain that power is the rate at which energy is transformed from one form to another.

• Identify the relationship between power, potential difference and current.

• Perform a first-hand investigation and use available evidence to demonstrate the relationship between current, voltage and power for a model 6V to 12V electric heating coil.

#### Lesson 2 | Energy and power

• Identify that the total amount of energy used depends on the length of time the current is flowing and can be calculated using:

• Solve problems and analyse information using:

and

• Explain why the kilowatt-hour is used to measure electrical energy consumption rather than the joule.

• ### 53 Lessons

Lessons by expert teachers that cover the NSW Preliminary Physics Syllabus comprehensively.

• ### 53 Practice questions

53 lesson quizzes that include a variety of questions. This course also includes 20 focus level and 4 module level tests, as well as a comprehensive end of course practice exam.

• ### 49 Hours of video

Videos that fully explain complex physics questions through animation, practical experiments, and tutorials.

• ### 21 Interactive activities

Interactive activities that help you explore and understand key syllabus dot points as well as additional resources such as an interactive oscilloscope.