Lesson test: Electric current, charge in motion

1.[1p]
Electric current is defined as

the rate at which charge passes a point, in coulombs per second

Correct

the total charge in a wire

The answer is: the rate at which charge passes a point, in coulombs per second

the voltage across a component

The answer is: the rate at which charge passes a point, in coulombs per second

the force on a charge

The answer is: the rate at which charge passes a point, in coulombs per second

3.[2p]
Conventional current is defined in the direction that

positive charge would move, from high potential to low

Correct

electrons move

The answer is: positive charge would move, from high potential to low

the field points inside the battery

The answer is: positive charge would move, from high potential to low

the wire is coiled

The answer is: positive charge would move, from high potential to low

4.[2p]
A lamp lights almost instantly even though electrons drift very slowly because

the wire is already full of charge, and the field starts all of it moving at nearly light speed

Correct

the electrons speed up to light speed

The answer is: the wire is already full of charge, and the field starts all of it moving at nearly light speed

the current jumps over the wire

The answer is: the wire is already full of charge, and the field starts all of it moving at nearly light speed

the lamp stores charge in advance

The answer is: the wire is already full of charge, and the field starts all of it moving at nearly light speed

5.[2p]
A resistor in a series chain uses up current, so less current flows out of it than in.

True

The answer is: False

False

Correct

6.[2p]
An ammeter is connected in series with a component because

current is a flow through a point, so it must run through the meter

Correct

it reads the voltage across the component

The answer is: current is a flow through a point, so it must run through the meter

it must not carry any current

The answer is: current is a flow through a point, so it must run through the meter

series connection protects the battery

The answer is: current is a flow through a point, so it must run through the meter

7.[2p]
Connecting an ammeter directly across a battery is dangerous because

the ammeter has almost no resistance, so it offers the battery a near short circuit

Correct

it reads too high a voltage

The answer is: the ammeter has almost no resistance, so it offers the battery a near short circuit

it reverses the current

The answer is: the ammeter has almost no resistance, so it offers the battery a near short circuit

it stores charge

The answer is: the ammeter has almost no resistance, so it offers the battery a near short circuit

Sign in

Electric current, charge in motion

1.[1p]
Electric current is defined as

2.[2p]
A current of 0.5 A flows for 120 seconds. How many coulombs of charge pass?

3.[2p]
Conventional current is defined in the direction that

4.[2p]
A lamp lights almost instantly even though electrons drift very slowly because

5.[2p]
A resistor in a series chain uses up current, so less current flows out of it than in.

6.[2p]
An ammeter is connected in series with a component because

7.[2p]
Connecting an ammeter directly across a battery is dangerous because

1.[1p] Electric current is defined as

2.[2p] A current of 0.5 A flows for 120 seconds. How many coulombs of charge pass?

3.[2p] Conventional current is defined in the direction that

4.[2p] A lamp lights almost instantly even though electrons drift very slowly because

5.[2p] A resistor in a series chain uses up current, so less current flows out of it than in.

6.[2p] An ammeter is connected in series with a component because

7.[2p] Connecting an ammeter directly across a battery is dangerous because

1.[1p]
Electric current is defined as

2.[2p]
A current of 0.5 A flows for 120 seconds. How many coulombs of charge pass?

3.[2p]
Conventional current is defined in the direction that

4.[2p]
A lamp lights almost instantly even though electrons drift very slowly because

5.[2p]
A resistor in a series chain uses up current, so less current flows out of it than in.

6.[2p]
An ammeter is connected in series with a component because

7.[2p]
Connecting an ammeter directly across a battery is dangerous because