How Electricity Works?

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1. What is current?

The flow of charges, usually in the form of electrons

The newness of a battery or resistor

Something that blocks or slows the flow of electrons

The potential energy stored in a battery

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2. What is the unit for voltage?

Volts

Amperes

Ohms

Joules

3. What is the unit for resistance?

Volts

Amperes

Ohms

Joules

4. What is the unit for current?

Volts

Amperes

Ohms

Joules

5. What is shown in this picture?

Resistors connected in parallel

Batteries connected in parallel

Resistors connected in series

Batteries connected in series

6. What is the unit for energy?

Volts

Amperes

Ohms

Joules

7. The resistance of a hotplate is 48 Ω . How much current does the plate carry when connected to a 120-V source?

120 A

2.5 A

5760 A

0.4 A

8. Which of these is the equation for Ohm's Law?

W = Fd

V = IR

R = IV

PE = mgh

9. A certain steam iron carries a current of 6.4 A when connected to a 120 V source. What is the resistance of the steam iron?

1.875 Ω

0.05 Ω

768 Ω

18.75 Ω

10. In the picture, how are the lightbulbs connected?

In series

In parallel

They are not connected

11. What if a bird sat on a power line that was very close to the ground, placing one foot on the wire and one foot on the ground?

No current would flow through the bird, so nothing would happen

The bird would experience a voltage difference between the wire and the ground and would get fried

The bird's feet are insulated, so it doesn't matter what it touches

12. In the picture, how are the batteries connected?

In series

In parallel

They are not connected

13. A typical size-D battery has about how many volts?

0.05 V

100 V

1.5 V

9 V

14. Voltage is a measurement of what?

Radiant energy of a lightbulb in a circuit

Kinectic energy of a motor in a circuit

Potential energy stored in a battery

The flow of electrons

15. Why can birds sit on a power line?

Because birds have minimal resistance compared to household electronics, so current is diverted to the houses instead

Because the wire is in the air and air has infinite resistance so no current flows through the wire

Because birds' feet are insulated so current is not conducted through them

16.

What ultimately happens to the cow in this situation? During a thunder storm, if a lightning hits the ground near a cow, then the current starts to spread out in the groud. Since the ground is wet, it is easier to spread horizontally, and also, the ground is somewhat positively charged. When the current starts to spread while a cow is eating grass, the current flows from the cow's mouth (A), goes through its leg (B), and goes back to the ground. The current will flow until the voltage becomes zero.

Because cow's hind leg (D) has lower potential energy than its front leg (C) , the current can flow through the cow. The cow becomes a part of electric circuit.

All the current builds up in the cow's bell which will shock the rancher later.

Nothing happens to the cow.

The cow feels a slight tingle but continues eating.

The cow gets a big electric shock and probably dies.

17. In this graph, what does the slope of the line represent?

Constant voltage

Constant current

Constant energy

Constant resistance

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