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A voltage divider is formed by connecting a 6-kΩ resistor and a 2-kΩ resistor in series across a 20-V source. The voltage drop across each resistor would be, respectively:
15 V and 5 V.
For the circuit shown the value of the current I2 would be:
160 A.
The color code (bands 1 to 4) for a ½-W, 5.6-Ω resistor with a tolerance of ±10 percent would be:
green, blue, gold, silver.
Resistance wire is designed primarily to convert electricity energy into:
heat energy.
The resistor shown would be rated for a resistance value of ________ and a tolerance of ________.
1,500 Ω; ±2 percent
Current flow through a resistor produces heat.
True
Two resistors R1 and R2 give a combined resistance of 4.5 ohms when connected in series and 1 ohm when connected in parallel, the resistance values are:
1.5 Ω and 3 Ω.
The resistor shown would be rated for a resistance value of ________ and a tolerance of ________.
10 Ω; ±10 percent
For the circuit shown, if each resistor has a value of 100 Ω the total resistance would be:
100 Ω.
The total resistance for the circuit shown is:
115 Ω.
The resistor shown would be rated for a resistance value of ________ and a tolerance of ________.
3,300 Ω; ± 20 percent
For the circuit shown the value of the current I1 would be:
320 A.
For the circuit shown the value of the voltage E1 would be:
4.5 V.
The total resistance for the circuit shown is:
400 Ω.
A resistor with a color-coded value of 470 Ω and ±5 percent tolerance can have an actual resistance between ________ and ________ ohms.
446.5; 493.5
The resistance between the outside terminals of a linear potentiometer is measured and found to be 10 kΩ. The resistance between the wiper arm and an outside terminal is measured and found to be 3.5 kΩ. The resistance between the wiper arm and the other outside terminal should be:
6.5 kΩ.
What is the total circuit resistance when a 5-Ω resistance, a 25-Ω resistance, and a 30-Ω resistance are connected in series?
60 Ω
For the circuit shown the value of the voltage E2 would be:
6V
Why does running too many appliances on one circuit cause a fuse to blow or a circuit breaker to trip off?
As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of current.
Chip resistors are constructed using axial leads for connection to circuits.
False
The following resistor was measured and found to be 440 Ω: yellow, violet, brown, gold. This resistor would be within its tolerance limits.
False
The total resistance for the circuit shown is 5 Ω.
False
It is hard to manufacture a resistor with an exact number of ohms of resistance.
True
Resistors connected in parallel are used as current dividers.
True
Resistors connected in series are used as voltage dividers.
True
Rheostats are variable resistors used to control the amount of current flow in a circuit.
True
The length and width of the groove on a film-type resistor determines its resistance value.
True
The total resistance for the circuit shown is 1.94 Ω.
True
Trimmer potentiometers allow for very precise resistance adjustments.
True
Wire-wound resistors are used in circuits that carry high currents.
True
The color code (bands 1 to 4) for a 2-W, 10-Ω resistor with a tolerance of ±10 percent would be:
brown, black, black, silver.
When a resistor has a 2-watt rating, this means that it:
can safely dissipate 2 watts, or less, of power.
Potentiometers are connected using only two of their terminals.
false
Which of these variable resistors would most likely be used to control current using only two of its terminals?
rheostat
Which band of the five-band precision resistor color code designates the multiplier?
the fourth
Which of these is a miniature potentiometer that is used to calibrate a circuit and is usually found on printed-circuit boards?
trim pot
Resistors are used in a circuit to adjust and set voltage and current levels.
true
The physical size of a resistor has nothing to do with its resistance.
true
The product of the voltage across a resistor multiplied by the current through the resistor should not exceed the ________ rating of the resistor.
wattage
The color code (bands 1 to 4) for a 1-W, 4.7-kΩ resistor with a tolerance of ±5 percent would be:
yellow, violet, red, gold.
