Electric current 1

Electric current

By Bingxue Wang

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Puling your hat off and having your hair stand on end is an example of

Open Ended

What makes your computer work

​The energy of electric charges

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Electrical

energy

​

The rate of flow of electric charges (per second)​

Unit: ​•amperes, “amps", A.

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Electric current

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A wire with a current of 2 A has

as much charge passing by each second as a wire with a current of 1 A has.

Multiple Choice

Electric current is caused by the motion of

• Proton

• Electron

• Neutron

• All of the above

Multiple Choice

What is electric current?

• The rate at which charge passes a given point

• Materials opposition to the flow of charge

• The number of electric charge that pass a point

• The amount of work required to move each unit of charge

The direction of current and electron movement

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• charges always flow in the same direction.

• Generated by battery​

• current alternates direction

• Generated by powerplant​

Multiple Select

3. The two types of current are...

• Alternating Current

• Direct Current

• Floating current

• Fluctuating current

Multiple Choice

The electricity in our house is

• AC

• AD

• BC

• DC

Multiple Choice

An electric current flowing in one direction only

• fluctuating current

• direct current

• alternating current

• simple current

Multiple Select

Devices that used direct current

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What alternates in alternating current?

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What affects electric current?

​How do you change the speed of the flow?

Open Ended

How do you change the speed of the water flow?

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• Resistance: The opposition to the flow of electric charge. Unit: ohms, Ω

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What affects electric current?

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• Voltage/electrical potential: The amount of work required to move each unit of charge between two points. Unit: volts, V

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What affects resistance?

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​V: Voltage, I: Electric current

R: Resistance​

Multiple Choice

Voltage is simply defined as...

• what 'pushes' electrons
• what 'stops' electrons
• moving electrons

Multiple Choice

Current is...

• moving protons
• moving electrons
• measured in volts
• measured in ohms

Multiple Choice

Resistance is...

• What "slows down" electrons
• What "speeds up" electrons
• Moving electrons
• What "pushes" electrons

Multiple Choice

If the voltage stays the same, but the resistance goes up, the current will....

• increase (speed up)
• decrease (slow down)
• stay the same

Multiple Choice

A potential difference of 24 V is applied to a 150 resistor. How much current flows through the resistor?

• 0.15 A

• 3600 A

• 6.25 A

• 0.16 A

Multiple Choice

What size resistor would produce a 3 Amp current flow with a 12 Volt battery

• 1 Ohm
• 3 Ohms
• 4 Ohms
• 12 Ohms

Multiple Choice

What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?

• 25 V
• 10 V
• 2.5 V
• 0.4 V

Multiple Choice

This circuit has a 24 volt battery and the resistor is 8 ohms. How many amps are running through the circuit?

• 3 Amps
• 192 Amps
• 2 Amps
• 4 Amps

What affects electrical resistance?

​1. Composition

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•Some metals, such as silver and copper, have low resistance and are very good electrical conductors. Other metals, such as iron and nickel, have a higher resistance.

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•Electrical insulators such as plastic have such a high resistance that electric charges cannot flow in them at all.

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Fun time!​

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2. Thickness

3. Length

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The longer,

More resistance​

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4. Temperature

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Multiple Choice

Which wire has more resistance?

Multiple Choice

The unit electric current is measured in is

• Volt

• Ampere

• Newton

Multiple Choice

What is the unit of measurement for resistance?

• Voltage

• Ampere

• Watts

• Ohms