Ohm's Law
What is the formula for Ohm’s Law?
V = I × R (Voltage = Current × Resistance)
What is a breadboard used for in electronics?
It is used to build and test electronic circuits.
What is electrical power measured in?
Watts (W)
What is the unit of electric current?
Ampere (A)
What atomic particle is responsible for the flow of electricity in a circuit? What is the charge?
Electrons. Negative.
What is the unit of resistance in Ohm’s Law?
Ohms (Ω)
What do the horizontal rows on a breadboard typically represent?
The horizontal rows are for power and ground connections.
What is the formula to calculate power in a circuit?
P = V × I (Power = Voltage × Current)
What is the force that causes electrons to move?
Voltage
What part of a circuit can turn the flow of electrons on and off?
A switch
If the current through a resistor is 2 Amps and the resistance is 5 Ohms, what is the voltage across the resistor?
10 Volts (V = I × R, so V = 2 × 5)
Why should jumper wires be used when building a circuit on a breadboard?
Jumper wires are used to make temporary connections between different points on the breadboard.
How much power is used by a 10V battery if the current is 2 Amps?
20 Watts (P = 10V × 2A)
What type of material typically has very low resistance and allows current to flow easily?
Conductors, like copper or silver.
What happens to electron flow when a circuit is open?
The flow of electrons stops.
A circuit has a voltage of 12V and a resistance of 4Ω. What is the current flowing through the circuit?
3 Amps (I = V / R, so I = 12 / 4)
How would you connect a 9V battery to a breadboard to power a simple circuit?
You would connect the positive terminal of the battery to the breadboard's power rail and the negative terminal to the ground rail.
A device uses 2 kW of power. How many kWh will it consume in 4 hours?
8 kWh (kWh= Power × Time, 2kW × 4h = 8kWh)
What happens to the flow of current if resistance increases in a circuit?
The flow of current decreases.
Draw a simple circuit that includes a power source, a switch, and a light bulb using standard schematic symbols.
Lightbulb symbol
Wire symbol
Battery symbol
Switch symbol
If the voltage is doubled and the resistance remains constant, what happens to the current in the circuit?
The current also doubles.
What are some common issues one might encounter when using a breadboard, and how can they be avoided?
Common issues include poor connections, short circuits, or loose components. These can be avoided by ensuring solid connections, checking for continuity, and ensuring that components are correctly placed on the breadboard.
If a light bulb uses 100W of power and operates for 5 hours, how much energy does it consume in kilowatt-hours?
0.5 kilowatt-hours (Energy = Power × Time, 100W × 5h = 500Wh = 0.5kWh)
Why does a longer wire have more resistance than a shorter wire?
Because electrons have to travel a greater distance, encountering more opposition.
How do electrons flow in a circuit?
Electrons flow along the wires from one side of the battery to the other.