Unit 10: Current and Circuits Review

This set of flashcards covers key concepts, definitions, and calculations from current and circuits.

What do the following safety devices measure or react to?

D) All The Above

What is the purpose of voltage difference in an electrical circuit?

A) Supplies energy to make charges flow

How would you draw two resistors in parallel?

D) side by side or one on top of the other (A

and B)

How would you draw a series

circuit?

C) both in a row

Three 6 ohm resistors are in series. What is the total resistance?

D) 18 ohm

What is the voltage drop across each branch of a parallel circuit?

D) depends on whatever the battery is

If electricity costs 10 cents per Kw*Hr, how much does it cost to run a

60 w bulb for one hour?

A) $0.006

Which of the following statements best describes the difference

between series and parallel?

B) series have a single path, parallel have two or more paths

The current in a DC series circuit:

B) is the same at all points

You use a 1200W dryer for 15 min and a 100W bulb for 1hr. How

much electricity did you use?

B) 400 watt-hours

Electric current will pass easily through:

B) a conductor

3 amps of current passes through a bulb of 1.5 ohms. What is the voltage of the battery?

C) 4.5 V

Almost all of the electrons flowing through a battery circuit come

from:

A) atoms in the wires

In an electrical circuit, the term current refers to:

C) flowing charges

An ohm is the unit of measurement for:

D) resistance (Ὠ)

Direct current (DC) and alternating current (AC) differ in:

C) the direction of charge flow

What does a power company sell to its customers?

D) energy (1kWhr = 3.6x10 6 joules)

What is the voltage drop across 3 individual identical resistors in series with a 3V

battery?

A) 1 volt

The electrical outlets in your home are wired in:

A) parallel (so the entire house does not go out)

If a microwave oven draws 11A when plugged into 120V, what is the

power rating?

A) 1.32 kW

Power describes the rate of___. Power is calculated in a circuit by

multiplying V times___?

D) energy flow. current

The mathematical relationship between current, voltage, and

resistance is known as:

C) Ohm’s Law

When you talk about a battery’s voltage, you are referring to:

D) amount of energy per unit

charge

Kirchoff’s current law applies to a parallel circuit because it states

that:

D) all current flowing into a branch

must flow out again

Positive electric charge:

D) repel positive charges and attract negative charges