BASIC CONCEPTS
What is the unit of electrical current?
Ampere(Amps)
State Ohm’s Law in formula form.
V = I × R
In a series circuit, how does current behave throughout all components?
Same current flows through all components
In a parallel circuit, how is voltage across each branch related to source voltage?
Same voltage across each branch
What tool is used to measure current, voltage, and resistance?
Multimeter
What is the opposition to current flow called?
Resistance
If V=12V and R=4Ω, what is the current?
3A
What happens to total resistance when another resistor is added in series?
Total resistance increases
If one branch in a parallel circuit opens, what happens to the current in other branches?
Other branch currents stay the same
What happens when a fuse blows?
It opens the circuit and stops current flow
What is the name of the device that measures voltage?
Multimeter
If current is 2 A and resistance is 10 Ω, find voltage.
20V
The total voltage in a series circuit equals the ______ of the voltage drops.
Total
What happens to total resistance when another branch is added in parallel?
Decreases
Does a fuse blow from overvoltage or overcurrent?
Overcurrent
If voltage increases and resistance stays the same, what happens to current?
Increases
Rearrange Ohm’s Law to solve for resistance.
R = V / I
If one resistor breaks in a series circuit, what happens to the current?
Current stops
Two resistors (6 Ω and 3 Ω) are in parallel. Find total resistance.
2 Ω
What is the purpose of color bands on a resistor?
Indicates resistor value and tolerance
What is the relationship between conductance and resistance?
They are inversely related
If a circuit has 24 V and draws 3 A, what is the total resistance?
8 Ω
A series circuit has three resistors (2 Ω, 3 Ω, 5 Ω). Find total resistance.
10 Ω
A 24 V source feeds two parallel resistors: 4 Ω and 6 Ω. Find total current.
10 Ω
In a DC circuit, if a wire shorts to ground but not back to the source, will current flow? Explain briefly.
No, because there’s no complete path back to the source