The rate of flow of electric charge:
Physics-15 Electrical Quantities Prequiz

Quiz
•
Physics
•
6th - 8th Grade
•
Medium
Jeffrey Reed
Used 2+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
current
voltage
ammeter
galvanometer
cell
Answer explanation
An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is defined as the net rate of flow of electric charge through a surface. The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers are often electrons moving through a wire. In semiconductors they can be electrons or holes. In an electrolyte the charge carriers are ions, while in plasma, an ionized gas, they are ions and electrons.
The SI unit of electric current is the ampere, or amp, which is the flow of electric charge across a surface at the rate of one coulomb per second. The ampere (symbol: A) is an SI base unit. Electric current is measured using a device called an ammeter.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
______ is a device that produces an electric current by converting chemical or radiant energy into electrical energy.
current
voltage
ammeter
galvanometer
cell
Answer explanation
An electrochemical cell is a device that generates electrical energy from chemical reactions. Electrical energy can also be applied to these cells to cause chemical reactions to occur. Electrochemical cells which generate an electric current are called voltaic or galvanic cells and those that generate chemical reactions, via electrolysis for example, are called electrolytic cells.
Both galvanic and electrolytic cells can be thought of as having two half-cells: consisting of separate oxidation and reduction reactions.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
This is the potential difference measured in volts. The amount of work to be done to move a charge from one point to another along an electric circuit:
current
voltage
ammeter
galvanometer
cell
Answer explanation
Voltage is the potential difference measured in volts. The amount of work to be done to move a charge from one point to another along an electric circuit.
Voltage, also known as electric pressure, electric tension, or (electric) potential difference, is the difference in electric potential between two points. In a static electric field, it corresponds to the work needed per unit of charge to move a test charge between the two points. In the International System of Units (SI), the derived unit for voltage is named volt.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A(n) _____ is a device used to measure current in a circuit
current
voltage
ammeter
galvanometer
cell
Answer explanation
An ammeter (abbreviation of Ampere meter) is an instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. For direct measurement, the ammeter is connected in series with the circuit in which the current is to be measured. An ammeter usually has low resistance so that it does not cause a significant voltage drop in the circuit being measured.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A device that uses an electromagnet to detect small amounts of current:
current
voltage
ammeter
galvanometer
cell
Answer explanation
A galvanometer is an electromechanical measuring instrument for electric current. Early galvanometers were uncalibrated, but improved versions, called ammeters, were calibrated and could measure the flow of current more precisely.
A galvanometer works by deflecting a pointer in response to an electric current flowing through a coil in a constant magnetic field. Galvanometers can be thought of as a kind of actuator.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
This is a unit of electrical resistance:
ohm
Direct Current (DC)
electromotive force (emf)
potential difference
Alternating Current (AC)
Answer explanation
The ohm (symbol: Ω, the uppercase Greek letter omega) is the unit of electrical resistance in the International System of Units (SI). It is named after German physicist Georg Simon Ohm. Various empirically derived standard units for electrical resistance were developed in connection with early telegraphy practice, and the British Association for the Advancement of Science proposed a unit derived from existing units of mass, length and time, and of a convenient scale for practical work as early as 1861.
Following the 2019 redefinition of the SI base units, in which the ampere and the kilogram were redefined in terms of fundamental constants, the ohm is now also defined as an exact value in terms of these constants.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Is electric current that flows in only one direction:
ohm
Direct Current (DC)
electromotive force (emf)
potential difference
Alternating Current (AC)
Answer explanation
Direct current (DC) is one-directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current.
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