Technical Science - Term 2 - Week 2

An electrical circuit is a closed loop that allows current to flow. The basic components of a circuit include a power source (like a battery), conductors (wires), and loads (like bulbs or resistors). Understanding these components is crucial for analyzing how circuits function. Circuits can be classified into two main types: series circuits, where components are connected end-to-end, and parallel circuits, where components are connected across common points.

Consider a series circuit with three resistors: R1 = 4Ω, R2 = 6Ω, and R3 = 10Ω. The total resistance (R_total) in a series circuit is the sum of all resistances. Thus, R_total = R1 + R2 + R3 = 4Ω + 6Ω + 10Ω = 20Ω. This total resistance affects the current flowing through the circuit when a voltage is applied.

In pairs, students will analyze given circuit diagrams and identify whether they are series or parallel circuits. They will discuss the implications of each type on the overall current and voltage distribution. For example, in a series circuit, if one component fails, the entire circuit stops functioning, whereas in a parallel circuit, other paths remain operational.

Students will complete a worksheet where they will calculate the current flowing through different circuits using Ohm's Law (V = IR). They will be given various voltage and resistance values and will need to find the current. For instance, if a circuit has a voltage of 12V and a resistance of 3Ω, the current can be calculated as I = V/R = 12V/3Ω = 4A.

• To store electrical energy
• To limit current flow
• To increase voltage
• To convert AC to DC

Answer: To limit current flow

Resistors are used in circuits to control the amount of current that flows through them, protecting components from excessive current.

• The circuit continues to function
• The circuit stops functioning
• Only the failed component stops working
• The voltage increases

Answer: The circuit stops functioning

In a series circuit, all components are connected in a single path; if one fails, the entire circuit is interrupted.

Answer: Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance.

Ohm's Law is fundamental in understanding how voltage, current, and resistance interact in electrical circuits.

• 10Ω
• 5Ω
• 3Ω
• 2Ω

Answer: 10Ω

In a series circuit, total resistance is the sum of all resistances: 2Ω + 3Ω + 5Ω = 10Ω.

• Current is the same through all components
• Voltage is the same across all components
• Total resistance is the sum of individual resistances
• If one component fails, the entire circuit fails

Answer: Voltage is the same across all components

In parallel circuits, each component experiences the same voltage, while the total current is the sum of the currents through each component.

Answer: The total current increases.