CIE A Level Physics复习笔记19.1.5 Energy Stored in a Capacitor
Calculating Energy Stored in a Capacitor
- Recall the electric potential energy is the area under a potential-charge graph
- This is equal to the work done in charging the capacitor to a particular potential difference
- The shape of this area is a right angled triangle
- Therefore the work done, or energy stored in a capacitor is defined by the equation:
- Substituting the charge with the capacitance equation Q = CV, the work done can also be defined as:
- Where:
- W = work done/energy stored (J)
- Q = charge on the capacitor (C)
- V = potential difference (V)
- C = capacitance (F)
- By substituting the potential V, the work done can also be defined in terms of just the charge and the capacitance:
Worked Example
Calculate the change in the energy stored in a capacitor of capacitance 1500 μF when the potential difference across the capacitor changes from 10 V to 30 V.
Step 1: Write down the equation for energy stored in terms of capacitance C and p.d V
转载自savemyexams
以上就是关于【CIE A Level Physics复习笔记19.1.5 Energy Stored in a Capacitor】的解答，如需了解学校/赛事/课程动态，可至翰林教育官网获取更多信息。
往期文章阅读推荐：
全网破防！ALevel CIE数学M1疑似错题？经济P2难度飙升？5月6日大考考情分析必看！
A-Level CIE就大规模泄题发布最严处罚！哪些考生必须重考？你的成绩怎么办？
翰林AMC8视频课重磅上线！
国际竞赛真题资源免费领取
