Lab A1 What is a Circuit Part 1

Lab A-1 What is a Circuit?

Part 1. 1. 2. 3. 4. 5. How many different combinations of the battery, bulb and wire completed the circuit? 1 2 3 4 None are correct

1 b Explain why you think some arrangements work? • Wires must touch opposite ends of the battery. • One end of the wire must touch the end of the light bulb or the metal thread of the bulb

A 1 a 1. 2. 3. 4. 5. Which circuit below will light the bulb? A and B A and C A and D ABD All will light

Part 2 ab The Switch works when the lever is down and touching the metal – this completes the circuit – CLOSED OPEN – means switch is up.

Part 2. 1. 2. 3. 4. Is the switch open or closed? Would the light be on or off? Open and On Open and Off Closed and On Closed and Off

Part 3. a 1. 2. 3. 4. Identify each symbol correctly – Motor, switch, battery, wire Bulb, wire, battery, switch Bulb, battery, switch, wire Motor, switch battery, wire

Part 3 1. Yes 2. No Example Diagram – Is it an Open circuit ?

Part 4 What does it mean to have a “closed circuit”? 1. All connections are complete 2. The bulb is not on 3. The battery is separate from the bulb

Which of the following did conduct Part 5 electricity? 1. 2. 3. 4. 5. 6. Pen cap string Rubber band Plastic straw Paper clip All conducted electricity

Part 5 Which of the following materials can electricity NOT travel through? 1. metal 2. water 3. air What are conductors? material through which electric current flows easily. What are insulators? material through which electric current cannot move

Lab A-2 Voltage and Current

Part 2 What is the voltage of 1 D-cell battery? 1. 1 amp 2. 1. 5 volts 3. 1. 5 coulombs

Part 2 What is the voltage of 2 D-cell batteries? 1. 2 amps 2. 3 volts 3. 2 coulombs

Part 2 The DC current is measured in what unit? 1. coulomb 2. volts 3. amperes

Part 3 a When measuring point A and B the voltage readings were … 1. the same 2. Slightly less 3. Slightly more

Part 4 a How much current is flowing in the circuit when the bulb is lit? 1. . 06 amps 2. 1. 5 volts 3. 110 amps

Part 4 c If you leave the meter connected but unscrew the bulb stays lit. 1. True 2. False

Lab A-3 Types of Circuits Series and Parallel

Part 1. a/b 1. 2. 3. 4. Does the current have any choice about where to go? Brightness of bulbs? Yes – bulbs very bright Yes – bulbs somewhat bright No – bulbs very bright No – bulbs somewhat bright What type of circuit is it? Series Circuit

Part 1. c What happens when you unscrew one of the bulbs? 1. The other bulb stays lit 2. The other bulb goes out Why? Circuit is broken

Part 2. a /b 1. 2. 3. 4. Does the current have any choice about where to go? Brightness of bulbs? Yes – bulbs very bright Yes – bulbs somewhat bright No – bulbs very bright No – bulbs somewhat bright What type of circuit is it? Parallel Circuit

Part 2. c What happens when you unscrew one bulb? 1. The other bulb stays lit 2. The other bulb goes out Why? In a parallel circuit each bulb has its own path to the battery.

Part 3. a Which type of circuit has brighter light bulbs? 1. Parallel 2. Series Why? In a parallel circuit each bulb has its own path to the battery.

Part 3 b Household wiring is a parallel circuit with each device on a separate branch of wiring. Advantages of this? • With parallel circuit … – Will provide a constant amount of energy to each device no matter how many other devices are on – Can turn devices on and off without affecting other devices – If used a series circuit all appliances would have to be on or off.

A-5 a Complete the Chart Below Both on Both off #1 on / #2 off #1 off / #2 on On Off Off

A-5 b Is this an AND or OR circuit? 1. AND 2. OR 3. Both

A-6 a Complete the Chart Below Both on Both off #1 on / #2 off #1 off / #2 on On Off On On

A-5 a An AND circuit is also known as …. 1. Series circuit 2. Parallel circuit 3. Both

A-6 a Is this an AND or OR circuit? 1. AND 2. OR 3. Both

A-6 a An OR circuit is also known as …. 1. Series circuit 2. Parallel circuit 3. Both

A-7 A car will sound if a warning bell if you open the door and the lights are on. What type of circuit is this? 1. AND / Series circuit 2. OR / Parallel circuit 3. Both Bell sounds only if door is open and lights are on.

A 3 -R 1. 2. 3. 4. Which is or are a series circuit? AB BC BCD All are series

1. 2. 3. 4. 5. 6. A Which of the following will be true? B C A 3 -R A and B A and C D A. Bulb A is brighter than b and c B. Bulb a is dimmer than b and c C. Bulbs b and c are equally bright D. Bulb a b and c are equally bright