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What is electrical current?
The flow of electrical charge.
What unit is current measured in?
Ampere (A).
What must be present for current to flow?
A closed circuit and a source of potential difference.
Define potential difference (voltage) and its unit.
The driving force pushing charge around; measured in volts (V).
What is resistance and its unit?
Anything that opposes current flow; measured in ohms (Ω).
State the formula relating charge, current, and time.
Q=I×t, where Q is charge, I is current, and t is time.
Describe current flow in a single, closed-loop circuit.
Current is the same value throughout the circuit.
How does resistance affect current?
Higher resistance decreases current, given a constant potential difference.
What symbol represents a closed switch in a circuit diagram?
A line with a break closed by a small line segment.
Calculate the charge transferred when 8 A flows for 1.5 hours.
Q= 8 × (1.5×3600) = 43,200 C
Note 
Flashcard (46)