Question

ohm’s law practice worksheet name: za’nyia
an alarm clock draws 0.5 a of current when connected to
a 120 volt circuit. calculate its resistance.

a subwoofer needs a household voltage of 110 v to
push a current of 5.5 a through its coil. what is the
resistance of the subwoofer?

a walkman uses a standard 1.5 v battery. how much
resistance is in the circuit if it uses a current of 0.01a?

a circuit contains a 1.5 volt battery and a bulb with a
resistance of 3 ohms. calculate the current.

what current flows through a hair dryer plugged into a
120 volt circuit if it has a resistance of 25 ohms?

Explanation:

First Problem (Alarm Clock Resistance)

Step1: Recall Ohm's Law

Ohm's Law is \( V = IR \), so to find resistance \( R \), we rearrange it to \( R=\frac{V}{I} \).

Step2: Identify Values

Voltage \( V = 120 \) V, Current \( I = 0.5 \) A.

Step3: Calculate Resistance

Substitute into the formula: \( R=\frac{120}{0.5}=240 \) ohms.

Step1: Use Ohm's Law Rearranged

We use \( R=\frac{V}{I} \) from Ohm's Law (\( V = IR \)).

Step2: Plug in Values

Voltage \( V = 110 \) V, Current \( I = 5.5 \) A.

Step3: Compute Resistance

\( R=\frac{110}{5.5}=20 \) ohms.

Step1: Apply Ohm's Law for R

Formula: \( R=\frac{V}{I} \).

Step2: Substitute Values

Voltage \( V = 1.5 \) V, Current \( I = 0.01 \) A.

Step3: Calculate R

\( R=\frac{1.5}{0.01}=150 \) ohms.

Answer:

240 ohms

Second Problem (Subwoofer Resistance)