Physics- Electricity and Circuits

Tommy runs his juicer every morning. The juicer uses 90 W of power and the current supplied is 4.5 A. What is the resistance of the juicer?

• 4.4 Ω

• 405 Ω

• 20 Ω

• .05 Ω

A resistor has a potential difference of 10V across it and a current of 2A flowing through it. What is the resistance of the resistor?

• 20Ω

• 5Ω

• 200Ω

• 0.2Ω

A 4 ohm resistor is replaced with a 2 ohm resistor. What happens to the current in the circuit?

• It halves

• It triples

• It doubles

• It quadruples

What needs to be changed to make this circuit work?

• Add an extra wire

• Flip one of the batteries

• Reconnect the wires to the lightbulb so that they are both touching the same connector

If bulb 1 burns out, what will occur?

• bulbs 2 and 3 will go out

• bulbs 2 and 3 receive more volts

• bulbs 2 and 3 will stay lit

In a Series circuit the more lightbulbs you add the brighter they get 

• False 
• True 

A _________ is a plug or cartridge containing a strip of metal that melts when more than a specified amount of current passes through it.

• fuse
• breaker
• circuit
• panel

A class prepared some electrical circuits using battery, connecting wires, and three light bulbs.  Which of these circuits can make the three bulbs light?

• A
• B
• C
• D

1 Joule of energy / 1 Coulomb of charge is the same as 1 __?

• Ampere

• Watt

• Volt

• Ohm

Keeping the potential difference constant the resistance of a circuit is halved . The current will become :

• one - third

• Double

• One - fourth

• Four times