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44 Cards in this Set
- Front
- Back
What equation represents the rule for total resistance in a series circuit? |
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What resistor symbol is this? |
Fixed |
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What resistor symbol is this? |
Variable |
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What resistor symbol is this? |
Variable |
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What resistor symbol is this? |
Tapped |
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What resistor symbol is this? |
Adjustable |
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What resistor symbol is this? |
Rheostat |
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A switch is connected in a series circuit. If the contacts on the switch are opened, the resistance of the circuit (including the switch) will ___? a. decrease b. increase (to infinity) c. not change d. significantly decrease |
b. increase (to infinity) |
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When resistors are connected in series, their values are ? to find the total circuit resistance a. added b. divided c. multiplied d. subtracted |
a. added Note: RT = Total Circuit Resistance R1 = 1st Resistor (in ohms) R2 = 2nd Resistor (in ohms) R3= 3rd Resistor (in ohms) RN = Nth Resistor (in ohms |
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If the current becomes excessive, the fuse or circuit breaker will ? and disconnect the load from the power source. a. close b. open c. short d. none of the above |
b. open |
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What is the current in the circuit if the voltage across resistor R1 is 15 volts? (Round the FINAL answer to two decimal places.) |
0.75A |
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The following circuit contains two resistors. One is a fixed value resistor, but the other is a variable resistor which is being used as a rheostat. Calculate the circuit current with the rheostat set at minimum value (0 ohms). (Round the FINAL answer to two decimal places.) |
0.02A |
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What is the total circuit voltage? (Round the FINAL answer to one decimal place.) |
20.3V |
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What is the formula for the total voltage applied to a series circuit when using two series-opposing power sources? |
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A circuit having only one current path is called a ____ circuit. a. grounded b. parallel c. series d. short |
c. series |
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When two batteries are connected as series additive power sources, the positive terminal of one battery is connected to the positive terminal of the other battery. True / False |
False |
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As the current through a series circuit increases, the total power dissipated in each component decreases. True / False |
False |
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Which is the formula used to determine the total power in a series circuit, when the total resistance and current of that circuit are known? |
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Find the total power in the circuit shown. PT = __ mW |
274.29mW |
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In a series circuit, loads which have the same voltage dropped across them will have ? . a. different resistance b. higher resistance values c. the same resistance values d. none of the above |
c. the same resistance values |
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Given the circuit and parameters shown, solve for the following: Voltage drop on R1, ER1/V1 = ___ V |
70V |
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Given the circuit and parameters shown, solve for the following: Voltage drop on R2, ER2/V2 = ___ V |
10V |
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Given the circuit and parameters shown, solve for the following: Voltage drop on R3, ER3/V3 = ___ V |
20V |
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In the circuit shown, the four resistors dissipate a total of 150 watts and each dissipates an equal amount of power. Solve for the following: What is the resistance of R1 in mΩ? |
960mΩ |
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In the circuit shown, the four resistors dissipate a total of 150 watts and each dissipates an equal amount of power. Solve for the following: What is the power dissipated by R1? |
37.5W |
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As a general rule, it is always safer to assume that any conductors you are working around are energized. True / False |
True |
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Is it ever desirable to work on live or energized electrical equipment? Yes / No |
No |
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Sometimes equipment must be energized to check operation, or conditions might not allow equipment to be de-energized. True / False |
True |
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Solenoid type voltage testers are rated for intermittent duty only and cannot be energized for more than ___ seconds at a time. a. 5 b. 10 c. 15 d. 30 |
c. 15 |
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What temperature does water freeze at? |
32° F and 0° C |
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In the circuit, the lamp is rated at 4 volts and 0.5 watts. What size resistor must R1 be in order to supply the correct current to this lamp? |
40Ω |
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What does this symbol represent? |
Single-pole, single throw switch |
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What does this symbol represent? |
Three-way Switch (also called a single-pole, double-throw) |
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What does this symbol represent? |
Four-way switch |
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What does this symbol represent?
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Lamp |
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What does this symbol represent? |
Push button switch |
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What does this symbol represent? |
Light Fixture |
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What does this symbol represent? |
Battery or Power Source |
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What does this symbol represent? |
Bell |
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What does this symbol represent? |
Outlet |
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All other units of measure are defined and compared to the four basic measurements of length, ____ . a. height, weight, and temperature b. height, width, and weight c. weight, consistency, and viscosity d. weight, time, and temperature |
d. weight, time, and temperature |
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Who can remove a lockout/tagout? I. Only the authorized person who installed the lockout/tagout. II. Only supervisory personnel may remove a lockout/tagout. III. In an emergency, only supervisory personnel may remove a lockout/tagout. IV. In an emergency and upon notification of the lockout/tagout person, only supervisory personnel may remove a lockout/tagout. |
e. I. and IV. |
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The resistance of test leads must be less than ___ ? a. 1 Ω b. 2 Ω c. 3 Ω d. 5 Ω |
a. 1 Ω |
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Given the circuit and parameters shown, find the total power for the circuit by determining the power consumed by each resistor. Be prepared to show your work in class. |
262.5W |
