EXAM REVIEW WITH SOLVED QUESTIONS
GRADED A+
◉ electrons . Answer: negatively charged particles that orbit around the
nucleus of an atom.
◉ protons . Answer: positively charged particles; constantly orbiting
with electrons.
◉ conductor . Answer: conducts electricity; electrons flow freely with
very little resistance; used to connect points of a circuit together.
◉ voltage (E) . Answer: the basic unit to measure potential difference in
charge between two points; the electrical pressure that causes current to
flow.
◉ Current (I) . Answer: the intensity of flow; measured in amperes or
AMPS with an Ammeter.
◉ Bus . Answer: a common signal carrying path.
, ◉ Impedance (Z) . Answer: (total opposition to AC current flow) when
considering frequency effect component; frequency dependant
opposition-applies to AC voltage and current.
◉ Resistance (R) . Answer: opposition or resistance to current flow;
measured in ohms.
◉ Resistors . Answer: limit current to a safe value; drop voltage to
required values.
◉ Ohm's Law . Answer: the mathematical relationship between voltage,
current, resistance, and power.
◉ Series Circuits . Answer: one path for current to flow; current is the
same throughout a series circuit.
◉ Electromagnetic Induction . Answer: the relative motion between a
wire and magnet!;relative motion between a magnetic field and a
conductor will induce or generate an AC current inside the conductor.
◉ Ground . Answer: the zero (0) Volt reference point in a circuit; often
chassis is connected to earth ground; ALWAYS green wire.
◉ the 3 Reasons for Ground: . Answer: Safety, Shield, and Simplify!