Some examples from this set of practice questions
1.
Define EMF
Answer: Electromotive force, it is the total energy supplied per coulomb of charge by the cell.
2.
Define current
Answer: The rate of flow of charge. Symbole = I Unit = Ampere (A)
3.
Define potential difference
Answer: Potential difference/ Voltage is the work done per unit positive charge Symbole = V Units = Volts (V)
4.
Define resistance
Answer: Resistance is a material\'s opposition to the flow of electric current Symbole = R Units = Ohm\'s (Ω)
5.
State Ohm\'s law
Answer: Current through a conductor is directly proportional to the potential difference across the conductor at a constant temperature.
6.
State 4 factors that influence resistance.
Answer: Length Thickness Material Temperature
7.
What is internal resistance? (Definition not required by IEB, just understand and know what it is)
Answer: Internal resistance usually means the electrical resistance inside batteries and power supplies that can limit the potential difference that can be supplied to an external load.
8.
What is a non-ohmic conductor?
Answer: Conductors that do not obey Ohm\'s law. Resistance changes
9.
What are examples of non-ohmic conductors?
Answer: Diodes, Transistors, semiconductors, light bulbs.
10.
Define power.
Answer: The rate at which energy is transferred to a component to perform a function.
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