Module 3 Flashcards
the flow of electrons through a wire
Electricity
different ways the electrons move within the wire
currents
- electrons move in one direction, from (-) negative to (+) positive.
- a constant current, flowing continuously until either it is switched off or its power source runs out of or stops generating power
Direct Current
electrons don’t flow, they simply vibrate back and forth from negative to positive and positive to negative
Alternating Current
a closed loop with just two elements: a capacitor and an inductor
here, an electric charge oscillates back and forth just like the position of a mass on a spring oscillates.
LC CIRCUIT
In what pattern does electricity flow in an AC circuit?
A. dash
B. dots
C. straight
D. wave
D
How does an electron move in a DC?
A. negative to positive
B. negative to negative
C. positive to negative
D. positive to positive
A
In what type of LC circuit does total current be equal to the current of
inductor and capacitor?
A. series LC circuit
B. parallel LC circuit
C. series-parallel LC circuit
D. all of the above
A
In what type of LC circuit does total voltage is equal to the current of
inductor and capacitor?
A. series LC circuit
B. parallel LC circuit
C. series-parallel LC circuit
D. all of the above
B
If the capacitance in the circuit is increased, what will happen to the
frequency?
A. increase
B. decrease
C. equal to zero
D. doesn’t change
D
Which of the following statements is NOT true about DC flow?
A. DC flows from negative to positive
B. DC flows at a constant rate
C. Battery operated items are examples of DC power
D. All DC powered items need to be plugged in
D
The unidirectional current is called
A. alternating current
B. electric charge
C. direct current
D. indirect current
C
The supply of electrical energy for a consumer is usually by AC because
A. transmission and distribution are easily done
B. it most suitable for variable speed motor
C. the voltage drop in a cable is minimal
D. cable power losses are negligible
A
Why is alternating current transfer more effective than DC transfer over long distances?
A. due to the height of power lines
B. due to the use of ac generators
C. due to step-up and step-down transformers reducing power losses
D. due to very high voltages
C
AC is produced by a generator and its charge is
A. positive or negative
B. positive and neutral
C. negative and positive
D. negative and negative
C
