Describe what a diode does in a circuit.

Look at the circuit, which switch (1 or 2) should be closed to make the lamp light?

Look at circuit. The component is a light-dependent resistor. Describe what happens when the amount of light falling on the light-dependent resistor changes.

Look at circuit. The component is a light-dependent resistor. Suggest the use for a circuit like this.

Suggest the use for a circuit like this.

Priya builds circuit as shown in the diagram. She finds that the lamps do not shine brightly. Suggest what Priya could add to the circuit to increase the current and make the lamps shine more brightly.

Priya builds circuit as shown in the diagram. She finds that the lamps do not shine brightly. Use your knowledge of energy and energy transfers to explain why the lamps will shine more brightly when this component is added.

Chen builds a circuit to measure the size of the current in different components. He draws a diagram of his circuit. The lamp can be replaced with other components. More than one cell can be connected in the circuit.

Chen has made a mistake in his diagram. Which component has he left out of his diagram?

Chen builds a circuit to measure the size of the current in different components. Here is a copy of the diagram. Add the missing component to the circuit.

Chen builds a circuit to measure the size of the current in different components. He draws a diagram of his circuit. The lamp can be replaced with other components. More than one cell can be connected in the circuit.

Chen cannot write a conclusion based on his results because he has not controlled one of the variables. State which variable is not controlled, and describe what Chen needs to do to make sure he can compare all his results properly.