Year 9 Electricity Test 2025 Review

A collection of flashcards covering key concepts from the Year 9 Electricity Test 2025, including circuit types, Ohm's law, and electrical components.

Which of the following materials is classified as an insulator: copper, nickel, rubber, or aluminium?

Rubber

In a series circuit, what happens to the other light globes if one globe goes out?

They all go out.

What is the definition of an electric current?

The continuous flow of charge in a wire.

When a battery is connected to a closed circuit, in which direction do electrons flow?

From negative to positive.

Resistance of a wire depends on material type, length, and thickness. According to the test, what factor does it NOT depend on?

Voltage applied across the wire.

Calculate the resistance of a circuit that draws a current of $3.0\,A$ and is connected to a $6.0\,V$ battery.

$$2.0\,\Omega$$

What is the formula for total resistance in a series circuit?

$$R_1 + R_2$$

If the resistance in a series circuit is increased, what happens to the current?

The current will decrease.

Identify two examples of static electricity mentioned in the transcript.

1. Rubbing a balloon with wool to make it stick to a wall. 2. Using conditioner to prevent the buildup of electric charges in hair.

If two charged plastic balls are repelling each other, what can be inferred about their charges?

The charges are the same.

What are the three essential components that an electrical circuit needs?

An energy source (battery), a conducting path (wires), and a load (e.g., light globe).

How are ammeters and voltmeters connected differently within a circuit?

An ammeter is connected in series, while a voltmeter is connected in parallel.

In a series circuit, is the current the 'same' or 'different' throughout the circuit?

Same

In a parallel circuit, is the voltage across the branches the 'same' or 'different'?

Same

What are two advantages of using parallel circuits for home lighting instead of series circuits?

1. Each light can be turned on and off independently. 2. If one bulb blows, the others remain lit.

Based on Ohm's Law, what is the formula used to calculate the resistance of Device A using values from a voltage-current graph?

$$R = \frac{V}{I}$$

What energy transformation occurs in a torch circuit?

Chemical energy (from the battery) transforms into electrical energy, which then transforms into light and heat energy.

What is the reading on voltmeter $V1$ if it measures the total voltage of two components in series, where $V2 = 6\,V$ and $V3 = 6\,V$?

$$12\,V$$