Disclaimer: Due to unforeseen difficulties, we have had to take down the images on this notes page. They will be replaced shortly. We apologise for the inconvenience, but hope that the new images will provide you with an even better learning experience.
- State that current is related to the flow of charge.
Current is the flow of charge (electrons) within a circuit.
- State that the current in metals is due to a flow of electrons.
Metallic bonding is the strong attraction between closely packed positive metal ions and a ‘sea’ of delocalised electrons. These delocalised elecetrons can carry charge and move freely through giant the metal structure, thus making metals conductive of electricity.
- Demonstrate understanding that a current is a rate of flow of charge, and recall and use the equation I = Q /t.
Current is the rate of flow of charge in a given point of the circuit.
I = Q ÷ t
where I=current (amperes), Q=charge (coulomb) and t=time (seconds/minutes)
- Use the term potential difference (p.d.) to describe what drives the current between two points in a circuit.
Potential represents how much energy there is to drive a current through the wire and is measured in volts (v).
- Distinguish between the direction of flow of electrons and conventional current.
At first scientists believed that electricity from the positive to the negative terminal of a battery, but then found out that it was actually the other way around- electrons flow from the negative to the positive termianl. In order to not confusing, they called the initial assumption ‘conventional current’.
- Demonstrate understanding that e.m.f. is defined in terms of energy supplied by a source in driving charge round a complete circuit.
Well, learn that definition.
Notes submitted by Lintha
Click here to go to the next topic.
Click here to go back to the previous topic.
Click here go back to the Science menu.
3 thoughts on “P12.3 – Current, Electromotive Force and Potential Difference”
these notes reallyyyy helped me, thank you and I appreciate your hard work to ubdate it
LikeLiked by 1 person
Your webpage is awesome and superb. Very well, it helps me in a lot of things like preparing notes and tests e.t.c. Keep it up and kindly update it according to the new syllabus and contents.
Thank you. We are trying our best to update all of the notes by the end of June. 🙂