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Electrical Engineering Voltage Resistors and Light Questions

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Showing Page:
1/6
2018
Name: _ _________________________ Date: ___May 4, 2020_______
Student Exploration: Circuits
Vocabulary: ammeter, circuit, current, electron, ohmmeter, Ohm’s law, parallel circuit,
resistance, resistor, series circuit, voltage
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
Strings of holiday lights can be designed in one of two ways. In some strings of lights, each light
is connected to the others along a single wire (in series). In others, each light is attached to its
own wire (in parallel).
1. Suppose a single light bulb burns out. How do you think this will affect lights that are strung
along a single wire? ____they will burn brighter or as bright ____________
2. How will a single burned-out bulb affect the string of lights if each light is attached to its own
wire? ___it will not affect the string of lights____________________________________
Gizmo Warm-up
The Circuits Gizmo shows a circuit board and a variety of
components. Create a circuit with a battery, a light switch, a wire,
and a light bulb, as shown. (Click the light switch to turn it to OFF.)
1. Click the light switch to turn it to ON. What happens? ___the
lightbulb turns on and shines brightly._____
2. Turn on Show current and select Electron flow. The moving dots represent a current of
electronstiny, negatively charged particlesmoving through the wire. Voltage is a
measure of how much more potential energy an electron at one end of a battery has than an
electron at the other end of the battery.
A. How does changing the battery’s voltage affect the current? _It increases the
battery’s current. The higher the voltage, the greater the current.___
B. How does changing the battery’s voltage affect the brightness of the light? _
__the higher the battery’s voltage, the brighter the light shines, or the brighter the
light.
3. Remove the wire. What happens? The light turns off and no longer shines.

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2/6
2018
Activity A:
Ohm’s law
Get the Gizmo ready:
Click Clear. Create the circuit shown at right.
(Use the 10-ohm resistor.)
Click on the battery. Set the Selected battery
voltage to 10 volts.
Introduction: Resistors are devices that slow the flow of current in a wire. The resistance of
the circuit to current is measured in units called ohms.
Question: What is the relationship between voltage, current, and resistance?
1. Form hypothesis: How do you think increasing the resistance in a circuit will affect the
current in the wire? __The current will decrease the current in the wire. V=IR, so I=V/R.
Therefore, increasing R to 2R decreases I from I to ½ I.___
2. Observe: Turn the light switch On to start the flow of current. An ammeter is a device that
measures current in Amperes (A). Drag the Ammeter ( ) to various parts of the circuit.
A. Is the current the same throughout, or does it change? _The current stays the
same._
B. What is the current in the wire now? ___1.00 A______________
3. Collect data: Measure the current in the circuit using the resistor and voltage combinations
given below.
Voltage
Resistance
Current
10 volts
10 ohms
1.00 A
20 volts
10 ohms
2.00 A
30 volts
10 ohms
3.00 A
Voltage
Resistance
Current
50 volts
20 ohms
2.50 A
50 volts
100 ohms
0.50 A
50 volts
200 ohms
0.20 A
4. Analyze: What is the mathematical relationship between voltage (V), resistance (R), and
current (I)? Express your answer as an equation: _____V=IR_____________
This equation is known as Ohm’s law.
5. Test: Test your equation with other combinations of voltage and resistance. Modify the
equation if necessary.

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Name: _ _________________________ Date: ___May 4, 2020_______ Student Exploration: Circuits Vocabulary: ammeter, circuit, current, electron, ohmmeter, Ohm’s law, parallel circuit, resistance, resistor, series circuit, voltage Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Strings of holiday lights can be designed in one of two ways. In some strings of lights, each light is connected to the others along a single wire (in series). In others, each light is attached to its own wire (in parallel). 1. Suppose a single light bulb burns out. How do you think this will affect lights that are strung along a single wire? ____they will burn brighter or as bright ____________ 2. How will a single burned-out bulb affect the string of lights if each light is attached to its own wire? ___it will not affect the string of lights____________________________________ Gizmo Warm-up The Circuits Gizmo shows a circuit board and a variety of components. Create a circuit with a battery, a light switch, a wire, and a light bulb, as shown. (Click the light switch to turn it to OFF.) 1. Click the light switch to turn it to ON. What happens? ___the lightbulb turns on and shines brightly._____ 2. Turn on Show current and select Electron flow. The moving dots represent a current of electrons—tiny, negatively charged particles—moving through the wire. Voltage is a measure of how much more potential energy an electron at one end of a battery has than an electron at the other end of the ...
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