To determine how long a 292 Wh (watt-hour) power bank will last when powering a bubble machine that uses 88 W, you can use this simple formula:

$\text{Time (hours)} = \frac{\text{Battery Capacity (Wh)}}{\text{Power Consumption (W)}}$

Step-by-step calculation:

1. The power bank has a capacity of 292 Wh.
2. The bubble machine consumes 88 W of power.

Now, applying the formula:

$\text{Time} = \frac{292 \, \text{Wh}}{88 \, \text{W}} = 3.32 \, \text{hours}$

Result:

The 292 Wh power bank will last approximately 3.32 hours when powering a bubble machine that consumes 88 W.

Clarification:

The information about 1.1A @ 120V refers to the electrical current and voltage the machine draws, which gives us a power calculation confirmation: $\text{Power} = V \times I = 120 \, \text{V} \times 1.1 \, \text{A} = 132 \, \text{W}$ However, you provided that the machine runs on 88 W, so I assume you're working with that figure, which is lower. If 88 W is indeed accurate, the calculation holds at 3.32 hours.

Would you like more details or clarifications?

Related questions:

1. How can I convert different units to calculate power consumption more accurately?
2. What factors could affect the real-life duration of the power bank?
3. How does a power bank's efficiency impact these kinds of calculations?
4. Can I use the same formula for other appliances with different power ratings?
5. What happens if the bubble machine’s actual power consumption fluctuates during use?

Tip:

When using power banks, always account for the efficiency losses (usually around 85-90%), which can slightly reduce the actual run time.