7.1 The following table gives a range of electric circuit components and their symbols. Study
the table and answer the questions that follow: (14)

7.1.1 Which ONE of the above components cannot be connected in series with other components?
(2)
7.1.2 An ammeter measures the electrical current of an electric circuit. Define the term ’electrical current’ (2)
7.1.3 A conductor that resists the flow of electrical current is called a ‘resistor’. Name two factors which influences the resistance of a conductor. (4)

7.2. A group of learners were doing some investigation.They wanted to measure the voltmeter reading across a battery of 2 cells, when this battery is connected to a resistor. They also wanted to measure the current flowing through the circuit.They connected the components as shown in the
diagram.

Their teacher saw the connections and said that there are two major mistakes in the connection.Their teacher drew a correct circuit diagram for the learners so that they can do the investigation.

7.2.1 Mention the two major mistakes in the connection made by learners. (2)
7.2.2 Draw the correct circuit diagram that the teacher drew for the learners, where there
are no major mistakes. Include a switch in the circuit diagram.
(4)

TOTAL [14]

## Formal experiment 1: Heating and cooling curve of water

Aim

To investigate the heating and cooling curve of water.

Apparatus

beakers

ice

Bunsen burner

thermometer

water

Chipa Thomas Maimela‘s insight:

Method

Place some ice in a beaker.

Measure the temperature of the ice and record it.

After 1 minute measure the temperature again and record it. Repeat every minute, until at least 3 minutes after the ice has melted.

Plot a graph of time versus temperature for the heating of ice.

Heat some water in a beaker until it boils. Measure and record the temperature of the water.

Remove the water from the heat and measure the temperature every 1 minute, until the beaker is cool to touch.

Warning:

Be careful when handling the beaker of hot water. Do not touch the beaker with your hands, you will burn yourself.

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