Electricity and Circuits flashcards

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What is electric charge?Charge and Current: A property of matter associated with electric interactions.
What does electrically neutral mean?Charge and Current: Net positive and negative charges balance.
What is charge conservation?Charge and Current: Total charge remains constant in an isolated system.
What is electric current?Charge and Current: Charge flow per time.
What is potential difference?Charge and Current: Energy change per unit charge.
What defines conventional current direction?Charge and Current: The direction positive charge would move.
Can charge be created by merely charging a comb?Charge and Current: No; charge is redistributed in the ordinary model.
What is resistance?Voltage and Resistance: The ratio of voltage across a component to current through it.
What is Ohm’s law for an ohmic resistor?Voltage and Resistance: V = IR.
What is the ohm?Voltage and Resistance: One volt per ampere.
Are all devices ohmic?Voltage and Resistance: No, some have nonlinear voltage–current behavior.
When is V=IR applicable?Voltage and Resistance: For an ohmic component under its stated conditions.
What is resistance measured in?Voltage and Resistance: Ohms.
What does electrical power measure?Voltage and Resistance: Rate of energy transfer.
What is a parallel circuit?Series and Parallel Circuits: Multiple branches sharing the same two nodes.
What is branch voltage in parallel?Series and Parallel Circuits: The same across each branch in the ideal model.
What is the junction current rule?Series and Parallel Circuits: Incoming current equals total outgoing current.
What happens to ideal R_eq when a branch is added?Series and Parallel Circuits: It decreases if the added path conducts.
What is equal through series elements?Series and Parallel Circuits: Current.
What is equal across parallel branches?Series and Parallel Circuits: Potential difference.
How do parallel branch currents combine?Series and Parallel Circuits: They add at a junction.
How does parallel equivalent resistance compare with a branch?Series and Parallel Circuits: It is less than the smallest positive branch resistance.