Download EMA 110-Test 1

______________________________ Name
Course: EMA-110
9 September 2013
Instructor: Dale Swick
\
Instructions: Choose the correct answer OR Answers for the questions below.
_________1) Electrical current is the flow of _________ past a point.
a. Electrons
b. Protons
c. Neutron
d. Higgs Bosons
_________2) Electrical current is given the symbol I and measured in
a. Volts
b. Ohms
c. Amps
d. Seconds
________3) A possible source of Direct Current
a. wall outlet
b. battery
________4) Resistance is given the symbol R and is measured in
a. foot lbs
b. watts
c. volts
d. ohms
________5) Electrical potential is given the symbol V and is measured in
a. ohms
b. amps
c. volts
d. watts
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______________________________ Name
9 September 2013
Course: EMA-110
Instructor: Dale Swick
________6) 1 Mohm =
a. 105 ohms
b. 0.001 ohms
c. 1,000,000 ohms
d 106 ohms
________7) 10 millivolt/10 milliohms =
a. 10 amps
b. 1 watt
c. 1 volt
d. 1 amp
e. 1000 amps
________8) 100 microamps x 10 Kohms =
a. 10-4 volts
b. 100 volts
c. 1 volt
d. 100 watts
________9) The electrical measurement that can be performed on a deenergized
is______________.
a. power
b. voltage
c. current
d. resistance
e. Frequency
________10) Inductance is measured in _______________
a. Hertz
b. Ohms
c. Henries
d. Farads
________11) Capacitance is measured in ______________
a. Hertz
b. Ohms
c. Henries
d. Farads
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______________________________ Name
Course: EMA-110
9 September 2013
Instructor: Dale Swick
________12) If 2 resistors have the same color code, but 1 is physically larger then
a. resistance value is the same
b resistance value is different
c. the larger 1 will pass more current without damage
d. the smaller 1 has a higher power rating
13) What is the worst possible outcome from an electrical shock?
avoid this?
And what is the best way to
14) Basically all electrical problems can be simplified to drawing too much current or no current
through a circuit or portion of a circuit if the power supply is operating correctly.
We call these 2 faults _________ and _________.
15) Draw the symbol for a battery, a resistor, and a normally open push button switch.
In the following paragraph use the following word list to fill in the blanks. Some words will be
use more than once, some may not be used.
electron
proton
neutron
positive
conductor
insulator
blocks
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negative
conducts
______________________________ Name
9 September 2013
Course: EMA-110
Instructor: Dale Swick
The atom and electricity
From Democritus in Greece to the present our view or the atom has changed drastically.
As originally hypothesized by Democritus, the atom was a small round marble like object that
was indivisible. In fact the word atom means indivisible in Greek.
This view held sway until the discovery of electrons. Originally called cathode says.
Thompson experimentally determined these were actually particles in 1911. In 1918 Rutherford
discovered the proton and in 1932 Chadwick discovered the neutron. As all these particles were
smaller and part of the atom (now called subatomic particles), Thompson proposed a new model
called the Plum pudding model. This model placed all the subatomic particles spread evenly
through the atom as plums in a pudding.
This model was accepted until Rutherford proved experimentally that most of the mass (loosely
weight or matter) was located in a very small volume in the center of the atom, and that
an atom was mostly space. To account for the new found properties of the atom Rutherford
proposed the planetary model. Easy to picture and accounting for the new found properties this
model is still taught today. In this model the nucleus or center contains the 2 heavy particles
________________ and _________________. These account for nearly all the mass of the
atom. In the nucleus the __________________ was discovered to have a positive charge and the
_______________ was discovered to have no charge.
The nucleus is surrounded by orbiting _______________ that have a _______________
charge. The secret to atomic interactions is that they depend only on the number of
____________ in the outermost ring. Less than 4, the element is a metal and will
_____________ electricity. More than 4, the element is a non-metal and will _____________
electricity. Exactly 4 and it is a semi-conductor.
Draw & Solve the 3 circuits on the board. Show all work, and be sure to include units.
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