Digital Electronics PLTW Exam Questions with Correct Answers Graded A+
Voltage (V) - Answers The difference in electrical potential energy between two places in a circuit.
Current (I) - Answers A flow of electric charge.
Resistance (R) - Answers the opposition of current flow (measured in Ohms)
Ohm's Law - Answers The current in a circuit equals the voltage difference divided by the resistance
Series Circuit - Answers A circuit in which all parts are connected end to end to provide a single path of
current.
Parallel Circuit - Answers A closed electrical circuit in which the current is divided into two or more paths
and then returns via a common path to complete the circuit.
Kirchoff's Voltage Rule - Answers The algebraic sum of all voltages around any closed path must equal
zero.
Kirchoff's Current Law - Answers The current that goes into a branch is equal to the current that comes
out of a branch.
Discrete Components - Answers The most basic electronic units that can be incorporated into a circuit.
Small-Scale Integration (SSI) - Answers An integrated circuit having 12 or fewer gates in one package.
Medium Scale Integration (MSI) - Answers An IC that contains circuitry equivalent to more than 11 and
less than 100 gates.
INVERTER gate - Answers Also called a NOT gate or an inverting buffer. A logic gate that changes its
input logic level to the opposite state.
AND Gate - Answers A logic gate that takes in 2 inputs and only outputs True if both inputs are True.
NAND Gate - Answers Logic circuit that operates like an AND gate followed by an INVERTER. The output
of a NAND gate is LOW (logic level 0) only if all inputs are HIGH (logic level 1).
OR Gate - Answers A circuit with two inputs and one output defined such that its output is TRUE (or ON)
when either or both of its inputs are TRUE (or ON).
NOR Gate - Answers Logic circuit that operates like an OR gate followed by an INVERTER. The output of a
NOR gate is LOW (logic level 0) when any or all inputs are HIGH (logic level 1).
XOR Gate - Answers Outputs 1 when inputs are different. (Exclusive OR)
XNOR Gate - Answers Two-input logic circuit that produces a high output only when the inputs are
equal.
Voltage (V) - Answers The difference in electrical potential energy between two places in a circuit.
Current (I) - Answers A flow of electric charge.
Resistance (R) - Answers the opposition of current flow (measured in Ohms)
Ohm's Law - Answers The current in a circuit equals the voltage difference divided by the resistance
Series Circuit - Answers A circuit in which all parts are connected end to end to provide a single path of
current.
Parallel Circuit - Answers A closed electrical circuit in which the current is divided into two or more paths
and then returns via a common path to complete the circuit.
Kirchoff's Voltage Rule - Answers The algebraic sum of all voltages around any closed path must equal
zero.
Kirchoff's Current Law - Answers The current that goes into a branch is equal to the current that comes
out of a branch.
Discrete Components - Answers The most basic electronic units that can be incorporated into a circuit.
Small-Scale Integration (SSI) - Answers An integrated circuit having 12 or fewer gates in one package.
Medium Scale Integration (MSI) - Answers An IC that contains circuitry equivalent to more than 11 and
less than 100 gates.
INVERTER gate - Answers Also called a NOT gate or an inverting buffer. A logic gate that changes its
input logic level to the opposite state.
AND Gate - Answers A logic gate that takes in 2 inputs and only outputs True if both inputs are True.
NAND Gate - Answers Logic circuit that operates like an AND gate followed by an INVERTER. The output
of a NAND gate is LOW (logic level 0) only if all inputs are HIGH (logic level 1).
OR Gate - Answers A circuit with two inputs and one output defined such that its output is TRUE (or ON)
when either or both of its inputs are TRUE (or ON).
NOR Gate - Answers Logic circuit that operates like an OR gate followed by an INVERTER. The output of a
NOR gate is LOW (logic level 0) when any or all inputs are HIGH (logic level 1).
XOR Gate - Answers Outputs 1 when inputs are different. (Exclusive OR)
XNOR Gate - Answers Two-input logic circuit that produces a high output only when the inputs are
equal.
