Question 5
Use two 1.5 V electric cells in holders, two LED lamps or 3 V lamps, electrical wires and two switches (a breadboard is optional). The cells are in series; each lamp has its own switch in a separate parallel branch, as shown.
Look at the circuit diagram. Gather the components and build the circuit. Ensure that the circuit is complete and that all connections are secure before turning on the switches. Turn on switch 1. Observe and record the brightness of each lamp in the table. Turn on both switches. Observe and record the brightness of both lamps together. Record any changes in brightness between either or both lamps.
| Action | Observation of brightness of lamp |
|:-|:-|
| Turn on switch 1. | Lamp 1: ___; Lamp 2: ___ |
| Turn on switch 2. | Lamp 1: ___; Lamp 2: ___ |
Look at the circuit diagram. Gather the components and build the circuit. Ensure that the circuit is complete and that all connections are secure before turning on the switches. Turn on switch 1. Observe and record the brightness of each lamp in the table. Turn on both switches. Observe and record the brightness of both lamps together. Record any changes in brightness between either or both lamps.
| Action | Observation of brightness of lamp |
|:-|:-|
| Turn on switch 1. | Lamp 1: ___; Lamp 2: ___ |
| Turn on switch 2. | Lamp 1: ___; Lamp 2: ___ |
