1.E: Self-Test 1
- Page ID
- 3265
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)- What are the tiny particles that matter is made of called?
- Compounds
- Atoms
- Ions
- Protons and neutrons
- What are elements called that have atoms with electrons that are easily freed?
- Ions
- Conductors
- Insulators
- Elements
- Which of the following best describes copper?
- Conductor
- Insulator
- Semiconductor
- Valence electron
- Why are insulators useful?
- They transport an electrical charge.
- They do not transport an electrical charge.
- They readily release valence electrons.
- They will ionize easily when subjected to voltage.
- In what units is current measured?
- Volts
- Amperes
- Ohms
- EMF
- A source of electromotive force can be from a chemical reaction.
- True
- False
- In a DC circuit the poles alternate from positive to negative.
- True
- False
- What is the device called that is used to turn a circuit on and off?
- A control
- A conductor
- A load
- A protector
- Which of the following best describes an electric motor?
- A control
- A load
- A fuse
- A conductor
Use Ohm’s law for the following questions.
E = I × R, where:
- Volts (V) is represented by “E” for electromotive force.
- Amperes (A) is represented by “I” for intensity of current.
- Ohms (Ω) is represented by “R” for resistance.
- If resistance in a circuit is 6 Ω and the pressure is 24 V, what is the current flow?
- 2 A
- 4 A
- 6 A
- 8 A
- If a circuit had a current flow of 8 A and the resistance is 20 Ω, what is the pressure in volts?
- 120 V
- 160 V
- 2.5 V
- 25 V
- If a circuit has a current flow of 5 A and a pressure of 120 V, what is the resistance?
- 24 Ω
- 12 Ω
- 6 Ω
- 3 Ω
Use the power formula for the following questions.
watts = volts × amps or P = E × I
- How much power will a heater produce if it uses 15 A in a 120 V electrical system?
- 1800 W
- 1500 W
- 900 W
- 1200 W
- How many amps will flow through a 60 W headlight bulb in a 24 V system?
- 6 A
- 2.5 A
- 25 A
- 8 A
- Use Ohm’s law to complete the following chart.
voltage
current
resistance
500 mA
240
12
1000
12
8 A
5
20 000
120
10
0.15 A
80
3
0.0002 A
- Use the power formula to complete the following chart.
power
voltage
current
1500 W
12.5 A
40 W
12 V
12 V
300 mA
200 W
10 A
96 W
12 V
12 V
40 A