Electricity & Ohm's Law

Math

100

A circuit has a voltage of 100V and a resistance of 1000 Ohms. What is the current?

0.1A

200

A circuit has a current of 2A and a resistance of 100 Ohms. What is its voltage?

200V

300

A meter indicates a current flow in a circuit of 0.5 A. The circuit resistance is 500 Ω. What is the value of E?

250 V

400

If the applied voltage is 400 V and resistance is 20,000 Ω, what is the value of I?

I = 0.02 A

500

A circuit has an applied voltage of 200 V that causes 50 mA current to flow. What is the circuit resistance?

4000 Ohms

Ohm's Law

100

As voltage increases, current _______.

Increases

200

The two variables that determine the current in a circuit

What is voltage and resistance

300

As resistance increases, current _______.

Decreases

400

How do I find the value of resistance using current and voltage?

R = E / I

500

How do I find voltage using resistance and current?

E = I x R

Circuits

100

What is the purpose of a fuse?

To prevent overload (short)

200

What allows the flow of electrons from a battery to a light bulb?

What is the conductor (wire)

300

What is the energy source in a circuit.

What is the battery (or power company)

400

What is the role of a resistor in a circuit?

To limit current/generate heat.

500

List 3 of the 4 parts of a simple circuit.

Power source 

Load

Conductor/pathway

Control device

Units

100

What is the unit for electromotive force (emf) in a circuit?

Volts

200

What is the unit for electric current in a circuit?

Amps

300

What is the unit for resistance in a circuit?

Ohms

400

A volt measures ________.

What is potential difference/voltage

500

What is the difference between voltage and current?

Voltage is a difference in charge between two poles.

Current is the quantity or flow of those electrons past a point.

Other stuff

100

True or False. In a conventional current, electrons flow from the negative pole to the positive pole.

False

200

A device for limiting the amount of current in household wires. Usually in box for easy access.

What is circuit breaker (or fuse) 

300

What does this symbol (~) designate on a multimeter?  

AC (alternating current)

400

A GFCI (ground fault circuit interrupter) will have buttons on it. What might one of those buttons say?

Ex. Test, Reset

500

List all 4 factors that can increase resistance in a circuit.

Increase in temp

Increase in gauge

Poor conductor

Increase length of wire