Chapter 12~practical Circuits 💫 Flashcards
Definitions, key ideas 💡 and formulae
Definition of internal resistance :
Resistance of the source that results in a loss of p.d. (voltage)
The 2 formulae for E (e.m.f)
- E = I(R +r)
- E = V+Ir
Ir - Stands for lost volts âš¡
Definition of terminal p.d. :
The potential difference across the an external resistor connected to an e.m.f. Source
Lost volts
The difference between the e.m.f. and the terminal p.d in a circuit. It is equal to the voltage âš¡ across the internal resistance.
Definition of a potential divider circuit :
A circuit in which 2 or more components are connected in series to a supply. The output voltage ⚡ from the circuit 💫 is taken across one of the components.
A source of variable p.d
Definition of a potential divider:
A circuit in which 2 or more components are connected in series to a supply. The output voltage ⚡ from the circuit 💫 is taken across one of the components.
Definition of a potentiometer :
°a circuit which allows the measurement of an e.m.f by comparison with a known e.m.f.
What is the difference of e.m.f. And p.d. In terms of energy â›® ?
E.m.f is the work done per unit charge when other forms of energy are converted to electrical energy.
Voltage is the work done per unit charge when electrical energy is converted to other forms.
E.m.f in laments terms for understanding
Voltage of the source
P. D. In laments terms for understanding
Voltage âš¡ across terminals of source (after save voltage is less through internal resistance)
Definition of emf according to learners guide:
But use other definition, this is good to know for multiple choices purposes.
°the energy ⛮ transferred by a source in driving a unit charge round a complete circuit 💫.
Definition of emf
The work done per unit charge when other other forms of energy are converted to electrical energy
Definition of p.d.
Is the work done per unit charge when electrical energy is converted to other forms of energy
Learn symbols 🔣 for circuits
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