Practice question · Match the pairs
Match each quantity to its definition.
- Current density
- Conductivity
- Electromotive force
- Internal resistance
- The constant relating current density to field
- Work per unit charge from a non-electrostatic source
- What makes terminal voltage sag under load
- Charge flow per unit area per unit time
Hints
- Two are field quantities and two belong to sources.
- EMF is measured in volts but is not a potential difference.
Show the answer
- Current density → Charge flow per unit area per unit time
- Conductivity → The constant relating current density to field
- Electromotive force → Work per unit charge from a non-electrostatic source
- Internal resistance → What makes terminal voltage sag under load
Why
Current density and conductivity describe the medium; EMF is the work a generator supplies per unit charge; and internal resistance is why a loaded source delivers less than its EMF.
Practise Steady Currents and Circuits
The app has 6 more questions on this lesson, and keeps your place in the course. Physics II is free to start.
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