QCAA Physics Alternative Sequence Electrical circuits

This value represents the charge of three elementary charges (like protons or electrons), not the total macroscopic charge calculated using the formula $Q = I \times t$.

This incorrect answer comes from dividing the current by the time in seconds ($3 / 180$), rather than multiplying them.

This results from multiplying the current by the time in minutes ($3 \times 3 = 9$), forgetting the crucial step of converting time to standard SI units (seconds).

Charge is calculated as current multiplied by time in seconds ($Q = I \times t$). Multiplying 3 A by 180 seconds gives 540 C, which is $5.4 \times 10^2$ C in scientific notation.

Power is defined as the rate of energy transfer over time ($P = E/t$). Power dissipation specifically refers to the rate at which electrical energy is converted into heat and lost from the circuit.

The ratio of voltage to current ($V/I$) defines electrical resistance, not power. Power is calculated as the product of voltage and current ($P = VI$).

The ratio of useful work performed to total energy expended defines the efficiency of a system, not power dissipation.

This describes the Law of Conservation of Energy, which states total energy input equals total energy output. Power dissipation is the rate of energy loss, not the total energy balance.

Potential difference, or voltage, is defined as the energy transferred per unit charge ($V = E/Q$), representing the energy available to move charges through a circuit.

Capacitance measures a component's ability to store electrical charge ($C = Q/V$), not the energy available for charges actively moving through a circuit.

Resistance is the opposition to the flow of electric current, which dissipates energy rather than measuring the energy available for the charges.

Current is the rate of flow of electric charge ($I = Q/t$), measuring how many charges move past a point per second rather than the energy they carry.