Physics A-Level
Internal resistance and terminal p.d.
What Internal resistance and terminal p.d. means in Physics A-Level, as defined for OCR.
Definition of Internal resistance and terminal p.d.
Check what you remember
Read the wording for your board, then hide it and explain Internal resistance and terminal p.d. in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
In a real cell some energy is dissipated inside the source because of its internal resistance, so the terminal p.d. is less than the e.m.f. when current flows.
Topics that use Internal resistance and terminal p.d.
- E.m.f. and p.d (OCR A-Level)
Related terms
- Applying W = VQ and W = EQ
- E.m.f.
- Electromotive force (e.m.f.)
- Energy transfer and charge
- Energy transfer in electric fields
- Kinetic energy of charged particles
- Potential difference
- Series and parallel p.d.
Using Internal resistance and terminal p.d. in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Physics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Physics A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge